d. Completion Date a. Project Name & Location b. Nature of ...sabra-wang.com/assets/sabra-wang-and-associates-inc-traffic... · current firmware. Work included ... Prepared several

8. Work by firms or joint-venture members which best illustrates current qualifications relevant to this project (list not more than 10 projects).

a. Project Name & Location b. Nature of Firm’s Responsibility c. Project Owner’s Name & Address d. Completion Date (actual or estimated) e. Estimated Cost (in thousands)

On-Call Traffic Engineering BC 1091 and 1142 and 1183 Baltimore, MD

Traffic Signal/Detector Design City of Baltimore Department of Transportation 417 E. Fayette Street Baltimore, Maryland 21201 Mr. Raj Sharma | 443-984-2158

BC 1091: 2012 BC 1142: 2014 BC 1183: 2017

Entire Project Work for Which

Firm Was / Is Responsible ITS Design, Planning,

& Communications

Traffic Engineering/Studies 1091: $1125 1142: $1000 1183: $1000

1091: $1.13M 1142: $1.00M 1183: $1.00M

Systems Engineering & Signing Design

Central Traffic Signal System Replacement and Traffic Signal Controller Upgrade: Preparing Systems Engineering Analyses, trade studies, functional requirements and specifications to upgrade the traffic signal system and controllers. The project will replace the current ATMS which is end-of-life, and replace the existing NEMA traffic signal controllers which do not have TSP in the current firmware. Work included assessment of existing conditions and constraints, such as the half-duplex serial communications, evaluation of alterative computerized traffic signal systems, cost estimates, development of functional requirements and specifications. Traffic Engineering Studies: Prepared signal warrant studies, pedestrian safety evaluations, phasing studies, and intersection capacity analyses. Projects included Northern Parkway at York Road phasing and LOS analyses, Pratt and Light Street Barnes Dance Evaluation, signal warrant and pedestrian safety studies at the GAF Facility on Ponca Street, an evaluation of the Wenburn Street Railroad Crossing Evaluation, a signal warrant and corridor pedestrian safety study along Patterson Avenue, an evaluation of TSP on Belair Road, and the downtown bike lane traffic analysis. Performed field studies including traffic counts, traffic studies (delays, queues, speeds, gaps), LOS studies, development of concept plans and cost estimates and a final technical report. Traffic Signal Design: Prepared IFB for Signal Reconstruction, Signal Rewiring and Detector Replacement. Prepared 34 traffic signal designs and 20 detector replacements including wireless, video and inductive loops. Signal work included preparation of base plans including as-builds of signal equipment and surveys, field review of existing equipment, utility and ROW research, and signal design and pedestrian detection and ADA ramp design. Also prepared the City’s signal design checklist. I-83 Major Guide Sign Upgrade: Prepared 30% design plans for upgrading signing along I-83, including evaluation and recommendations for attraction signing and routing, destinations, sign layout, messages and MUTCD conformance. CCTV Design: Prepared IFB and final engineering plans for the construction of 20 CCTV cameras in the City of Baltimore for arterial and freeway applications. Prepared specifications for cameras, encoders, copper and fiber communication equipment, poles and cabinets, quantities and estimates. Prepared CCTV design including bucket truck sighting analyses, location design, and power and communication design. Adaptive Traffic Signal Control Technology: Prepared Systems Engineering documents including trade studies, needs elicitation, Rule 940 compliance, Concept of Operations, System Requirements and Sole Source documentation; and detailed engineering design for 8 intersections on Northern Parkway including traffic signal design (poles, detector layouts) and communication design for hybrid 5.8 GHz wireless and 12-count fiber connecting to a trunk line and back to the TMC. TMC Communication Design: Prepared IFB for the replacement and installation of fiber and copper communication infrastructure to support the City’s Transportation Management Center’s CCTV, VMS and Traffic Signal networks. VMS Design: Prepared IFB for the installation of Variable Message Signs (VMS) and design plans for deployment of 11 VMS signs; developed specifications, prepared engineering design including photo renderings, location design, power and communications, and construction support. ITS Planning: Prepared the Citywide ITS Master Plan which included the vision for ITS deployment throughout the City including CCTV, Traffic signals, DMS, communications and TMC enhancements. Prepared the CCTV and VMS Strategic Plans which included an assessment of operational needs, identifying locations of VMS and CCTV citywide. Technology Assessments: Prepared a technology assessment for traffic signal battery back-up, VMS, CCTV cameras, communication media for traffic signals, speed cameras, pedestrian detection devices, and Bluetooth travel time devices. Traffic & ITS Technical Support: Performed training classes for City staff on the MD MUTCD, Synchro and Tru-Traffic software. Provided full-time, on-site traffic engineering support to the City Traffic Division. Prepared several successful applications for funding through BMC, FHWA/SHA such as CMAQ and TIGER funds. Prepared emergency evacuation and flush plans for eight different routes. Prepared a Citywide GIS of traffic counts and LOS information. Prepared project status maps for signal, communication and VMS JOC contracts. Prepared an assessment of the City’s organizational, staffing, and funding needs. As part of this study, performed extensive surveys to assess the state of the practice in traffic signal and ITS Management and Operations.



BaltimoreLINK Transit Signal Priority, Baltimore, Maryland

Traffic Studies Maryland Transit Administration Department of Transportation 6 St. Paul Street Baltimore, Maryland 21202 Mr. Greg Pederson | 410-767-3316

2018


Firm Was / Is Responsible Traffic Engineering Design

Transit Planning $500 $425

Signal Timing

Sabra, Wang & Associates, Inc. (SWA) is responsible for the design and implementation of Transit Signal Priority (TSP) on 200 high frequency buses at 200 intersections throughout the City of Baltimore as part of a complete overhaul of Baltimore’s bus transit system. The Maryland Transit Administration (MTA) is re-designing the entire local and express bus systems throughout Baltimore. The project includes adding 12 new high-frequency bus routes called BaltimoreLINK that will operate throughout the Baltimore region. To increase the speed, efficiency and reliability of transit in Baltimore, one aspect of the program re-design is to add Transit Signal Priority on all 200 BaltimoreLINK buses and at 200 intersections throughout the City. SWA is responsible for the following major tasks:

• Preparing a Concept of Operations document that will serve as a platform for stakeholder agreement on key performance measures and contain a basic plan for how the system will operate, including evaluation of traffic signal controllers and the central traffic signal system’s ability to accommodate TSP.

• Planning TSP locations throughout the City by evaluating traffic and transit data to determine at which traffic signals TSP should be installed using a GIS based intersection scoring process integrated with output from Synchro models, and making final selecting using VISSIM simulation analyses.

• Traffic Signal Design for TSP, including preparing engineering design plans, specifications and estimates for bid.

• Implementation of TSP, including engineering services during deployment such as configuration TSP parameters in the signal controller, verifying setup of the PRS configuration by the manufacturer, intersection testing, traffic signal timing fine tuning, and before and after studies of bus travel times.



Chesapeake Bay Third Crossing Feasibility Study Preliminary Traffic Assessment

Traffic Engineering

Maryland Transportation Authority 300 Authority Drive Baltimore, MD 21222 Ms. Melissa Williams 410-537-7848

2005


Firm Was / Is Responsible

$250 $60

Sabra, Wang & Associates, Inc. performed travel demand forecasting, transportation planning and preliminary feasibility analysis for a third roadway crossing of the Chesapeake Bay. SWA conducted a preliminary traffic assessment of each alignment for each potential crossing zone (northern, central, southern). Work included:

• Document existing roadway function and traffic characteristics for all affected roadways in each zone such as roadway class, ADT, seasonal factor, typical cross-section, access and traffic controls

• Determining the capacity of the existing bridge • Determining the LOS on the bridge based on the projected ADT for each

bridge alignment • Determining the K-factor and Directional Distribution for the existing

bridge for summertime and commuter conditions. • Determining the treatment for each roadway crossing of the proposed

alignment such as interchange, intersection, grade separation (no access) or termination

Evaluated impact on the terminus roadways including US 301, US 50, I-695, I-97, and MD 4 such as LOS, AADT, intersection and roadway improvements



2015 Papal Visit, Washington DC Special Event Planning Washington, DC

Traffic Studies & Modeling District of Columbia, DOT 55 M Street, SE, Suite 400 Washington, DC 20003 Mr. Wasim Raja | 202-671-2656

2015


Firm Was / Is Responsible Traffic Analysis & Simulation

Signal Timing/Traffic Management $43 $43

Public Outreach

Sabra, Wang & Associates, Inc. (SWA) provided traffic engineering, special event planning and public information and outreach support services for the three day visit of Pope Francis to the District of Columbia including coordination with the US Secret Service, various DDOT offices, US Capitol Police, the Metropolitan Police Department (MPD) and other local jurisdictions. SWA performed all traffic modeling, prediction, impact analyses and alternate route plans for the planned roadway closures. SWA developed and tested DMS message plans, planned Traffic Control Officer deployment locations, and developed, designed, implemented and fine-tuned special event signal timings for the three day visit. SWA’s traffic analysis and modeling of worst case scenario traffic conditions were used to develop closure and alternate route maps as well as traffic impact maps that were presented to the DDOT Director, the Mayor and distributed to the media and the public. SWA developed mitigation measures including a robust Public Information & Outreach campaign, specially modified signal timings, strategic deployment of Traffic Control Officers and placement and wording of Dynamic Message Signs. During the three day visit, SWA provided around-the-clock support and performance monitoring, including on-site traffic engineering staff for implementation of “on-the-fly” signal timing changes and regular traffic system reports that were communicated to DDOT upper management and to the public via social media. SWA’s efforts were successful, contributing to some of the lowest weekday congestion levels seen in the District.



Transportation Management Center Standard Operating Procedures (SOP) Assessment DDOT 2013-T-0127 On-Call Citywide

Standard Operating Procedures Assessment

District of Columbia, DOT 55 M Street, SE, Suite 400 Washington, DC 20003 Mr. Wasim Raja | 202-671-2656

2016



$212 $212

Sabra, Wang & Associates, Inc. (SWA) is the lead consultant for the DDOT A/E contract for traffic systems analysis, which includes assessment of the Transportation Management Center’s Standard Operating Procedures and Training Sessions. This task included the following scope of work:

Document Baseline Conditions: In this subtask, SWA obtained existing information through multiple activities, including meetings, interviews, shadowing of staff and reviewing existing documentation. Existing relevant documentation included documents such as manuals, current SOPs, standard forms, training program materials, organizational charts, etc. After initial meetings, a series of interviews with operations group leaders was held to understand the higher-level components that may not be observable in daily operations. This includes such items as operational concepts, monthly reporting processes and interfaces with regional stakeholders. To better understand and document operators' current daily procedures, SWA shadowed each supervisor or lead for at least one day each to witness and ask questions. In addition, SWA also watched operators at their jobs, where practical), recognizing that the group leaders may not encounter the same tasks or situations as operators. This information was reviewed, documented and used to develop a draft SOP.

Reconciliation: In the Reconciliation subtask, SWA evaluated findings from the Document Baseline Conditions task, identified differences in procedures between supervisors and operators, and prepared a brief report for DDOT in advance of a stakeholder workshop. This was a critical stage of the project, where multiple people needed to agree or reach a point of buy-in to reconcile divergent practices and embrace a uniform set of operating procedures.

Peer Review: As SWA worked with DDOT to update their SOPs, SWA reviewed best practices from a representative sample of other agencies with similar characteristics to DDOT in order to apply best practices and ideas from other peer agencies and adapt them to DDOT’s specific needs.

Gap Analysis: In the Gap Analysis subtask, SWA identified the most relevant best practices from the Peer Review task and presented the differences in operational procedures followed by DDOT staff alongside best practices from other agencies. This assessment, termed gap analysis, identified 1) whether DDOT’s practices were consistent with current industry standards, 2) if there are practices that DDOT was NOT performing that should be performed, and 3) similarly, if there are practices that DDOT was performing that should NOT be performed. This Gap Analysis Report was submitted to DDOT in advance of the stakeholder meetings to review and reconcile differences so that a draft SOP document can be developed.

The Baseline Conditions documentation and Gap Analysis helped to refine the necessary sections of SOP and training documents. As part of the stakeholder workshops, revised draft outlines of the SOP document were presented, and as a result of the workshops, SWA elicited necessary changes. SWA then documented decisions made during the workshops, which served to finalize the outlines of the SOP Document, Training Manual and Syllabus.

Draft/Final Documents and Testing of SOPs: SWA gathered all previous information along with the documented decisions from the workshops and developed draft SOPs, a draft SOP Desk Reference and draft training materials including operator and supervisor manuals and training syllabi. The final documents also established a system to monitor the SOPs at regular intervals. SOPs need to be updated or revised from time to time. However, doing so without taking a holistic approach will cause only parts of SOPs to be updated (i.e. ‘procedural-drift’) while others are not. Therefore, it was critical to set up protocols for conducting an evaluation of intra- and inter-departmental SOPs and revising them.

Training Sessions: SWA developed training materials concurrent to the development of the SOPs. Individual supervisors of the various branches in the TOD were consulted for their input and feedback on the training program and materials before they were finalized. The training manual will be utilized for training the TOD staff. SWA also tested the TOD staff on their understanding of the steps or instructions in completing an SOP and gave them the opportunity to provide feedback on whether any of the steps or instructions related to the SOPs were cumbersome or ambiguous. Based on the feedback, SWA will provide or provided additional training to clarify any outstanding concerns.



Dulles Corridor Strategic ITS Plan Dulles, Virginia

ITS Planning Dulles Transit Engineers Ed Vanover 703-288-5900

2006



Traffic Engineering $50 $50

SWA, as a subconsultant, identified ITS opportunities to enhance transportation effectiveness in concert with VDOT’s ITS initiatives and multi-year regional planning and to mitigate traffic congestion in the areas impacted by the Dulles Corridor Metrorail Project. Included airport information, parking information, toll information and arterial information. Inventoried CCTV, DMS and HAR devices, conducted workshops with stakeholders including VDOT, VDRPT, Fairfax County, MWAA and Dulles Transit Engineers. Developed deployment package of ITS architecture for entire corridor, including traffic management and incident response considerations.



Dulles Toll Road Safety and Operations Studies

Traffic Safety Metropolitan Washington Airport Authority Moe Wadda/ Mike Hackett 703-417-8600

2012-2015


Firm Was / Is Responsible Traffic Operations

Traffic Modeling Unknown Unknown

SWA coded and calibrated a detailed VISSIM model of the Dulles Toll Road from I-495 to VA 28/ Dulles Airport, a total of over 14 miles and 10 interchanges. Efforts included:

• Traffic data collection including queues, processing rates, and dwell times at 22 toll plazas and 57 toll lanes

• Review of transactions, vehicle classifications and payment types • Traffic signal analysis at 14 ramp terminal intersections • HOV modeling • Input composition including speed profiles and service profiles • GPS-based travel time and delays • Baseline capacity analysis for intersections and freeway segments • Baseline EZ-PASS market share assessment

Evaluated and prepared crash databases, crash density maps and collision diagrams for over 900 crashes and 10 interchanges.



Federal Highway Administration, SBIR2, Signal Operations Expert System

Synchro and VISSIM Analysis Intelligent Automation, Inc. 15400 Calhoun Drive, Suite 400 Rockville, Maryland 20855 Mr. Mark James | 301- 294-5221

2014


Firm Was / Is Responsible Incident Management

Signal Timing Research $200 $96

Sabra, Wang & Associates, Inc. (SWA) under task to Intelligent Automation, Inc. provided the following efforts related to the development of a “signal operations expert system” tool that would assist Traffic Management Centers and signal operations managers in the detection of traffic incidents and anomalies and the development and implementation of measures to mitigate their impacts. Work efforts included the following: • Assisted in identifying the overall system architecture, concept of operations, system components, TMC

applications and system interface • Identified signal timing and traffic incident scenarios and provided example traffic data for analysis • Selected a representative traffic network, generated traffic data based on the combinations of conditions

such as: locations, number of lanes blocked, lane groups, duration of incident, traffic demand and signal operations

• Provided operational knowledge on identifying the type, location, and cause of traffic incidents, and assisted in the development of rules in the expert system software toll

• Provided response solutions for mitigating the incident impacts • Provided assistance with simulations and interpretation of simulation outputs for performance evaluation

on the developed signal operations expert system toll • Identified measures of effectiveness, displays and thresholds for various measures of effectiveness

applications • Developed UTDF formats so that MOE data can be extracted directly from signal timing analysis tools such

as Synchro • BETA tested and evaluated the expert system tool and provided recommendations for

refinement/improvement • Assisted IAI in understanding the TMC operator’s concerns, experiences, and operational procedures

through meetings and TMC visits • Provided final technical report to summarize the technical research/development of the expert system and

assisted in the final demonstration to FHWA



Hatem Bridge Traffic Management Plans Harford and Cecil Counties

Traffic Engineering Maryland Transportation Authority 300 Authority Drive Baltimore, MD 21227 Roxane Mukai, P.E., PTOE Planning Manager | 410-288-8484

2009


Firm Was / Is Responsible Feasibility Studies

Stakeholder Coordination $100 $20

Sabra, Wang & Associates, Inc., as a subconsultant, coordinated with the Authority, State Highway Administration, Cecil and Harford County and emergency personnel stakeholders to identify and plan detour routes for short-term closures as well incident management during the long-term rehabilitation of the Hatem Bridge (US 40). Work included field review and inventory of primary and secondary routes, including guide signs, traffic control equipment, and truck compatibility. Prepared schematic plans for each freeway segment illustrating proposed detour route.



Howard Street – Improving Light Rail Travel Times Baltimore, Maryland

Traffic Studies Maryland Transit Administration Department of Transportation 6 St. Paul Street Baltimore, Maryland 21202 Mr. Greg Pederson | 410-767-3316

2015



Transit Planning $700 $215

Sabra, Wang & Associates, Inc. (SWA), as a subconsultant, was responsible for studying alternatives, and implementation of traffic signal control changes to reduce Light Rail Transit (LRT) Vehicle travel times along the Howard Street corridor between the Mount Royal and Camden Yards stations. Four major subtasks were:

• Evaluate and implement passive Transit Signal Priority (TSP) via optimization of signal timing and phasing to improve LRT travel times at both directions during the AM, Midday and PM signal timing patterns.

• Analyze the impact of adding detection for left turn movements and side streets using VISSIM.

• Evaluate the impact of preemption along Howard Street at Lexington Street, Saratoga Street, and Monument Street.

• Assist the City and MTA with field implementation of preemption using existing Siemens controllers and GTT phase selectors and train equipment.

• Document the improvements in travel times through before and after field studies at each level (passive and active TSP).

The project consisted of field studies and observations, train travel time and speed data collection, analysis of field collected data, technical reports and presentations, and evaluation of viable alternatives in a tiered approach. Northbound and southbound train trajectories were drawn in time-space diagrams after each level of improvement and were compared to the baseline conditions. The project required hands-on programming and restoration of Opticom/GTT phase selectors, radio/GPS antenna, on-board train equipment, and Eagle controllers. The project reduced by nearly 180 person-hours per day, reduced LRT travel times by 8%, and decreased the chance of stopping at a traffic signal by nearly 40%.



Intercounty Connector Contracts A, B, C & D/E Montgomery and Prince George’s Counties, MD

Signing/Pavement/Marking Design

Maryland State Highway Administration 707 N. Calvert Street Baltimore, MD 21202

Contract A: 2010 Contract B: 2010 Contract C: 2011

Contract D/E: 2015



Signal & Interconnect Design Traffic Analyses and Signal Timing Lighting Design Maintenance of Traffic Design A: $478.7 M

B: $559.7 M C: $513.9 M

D/E: $89.3 M

A: $2,400 B: $600 C: $740

D/E: $360

Transportation Management Plan

Construction Management

SWA was responsible for preparation of traffic engineering design plans for three segments (Contracts A, B, C & D/E) of this design-build project, including lighting, maintenance of traffic, preparation of the Transportation Management Plan, traffic analyses, traffic signal and interconnect, and signing and marking design. The work on all contracts included extensive coordination with the Contractor and the SHA General Engineering Consultant for design modifications to provide better value, increased safety, and facilitation of construction activities and to minimize costs. Our work included responding to RFIs and contractor field issues and reviewing and approving shop drawings.

Signing & Pavement Marking Design (Contract A): Prepared over 150 sheets of signing & marking plans for 6 miles of new interstate roadway, 6 miles of signing modifications to existing interstate roadways, 6 interchanges, and 5 miles of signing modifications to arterial roadways. Prepared preliminary signing concepts, detailed signing and marking design using GuidSign to for sign layouts, prepared proposed sign structure input sheets, and coordinated with sign structure designers.

Signal & Interconnect Design, Traffic Analyses and Signal Timing Plans (Contracts A & B): Performed traffic signal and interconnect design for 6 intersections on Contract A and 6 intersections on Contract B, including temporary signals design for MOT.

Traffic Analyses and Signal Timing Plans (Contracts A and B): Prepared signal warrant analyses based on MD MUTCD warrants for 6 intersections in Contract A and 6 intersections in Contract B. Prepared corridor-wide CORSIM models for ICC and the intersecting arterials, and intersection Level of Service and simulation analyses using Synchro/ SimTraffic. Prepared free of charge and coordinated signal timing plans using Synchro andMontgomery County policies. Prepared traffic analyses for construction impacts for Contract A.

Lighting Design (Contracts A, B, C & D/E): Prepared temporary and permanent lighting concept roll plans for the entire project limits per the RFP requirements. Photometric analyses including point by point calculations on the proposed pavement surface, light trespass calculations, and veiling luminance calculations were submitted along with the roll plans for approval. Upon the approval of the lighting roll plans, prepared the detail lighting designs on 50 scale plans for both temporary and ultimate conditions. The project included lighting for 12 interchanges, the installation of continuous lighting along cross streets, underpass lighting, tunnel lighting design, culvert lighting and sign lighting throughout the project limits. The lighting design included field inventories, base plan preparation, voltage drop computations, connector kits, layout of poles, arms, conduits, duct cables, identification of power sources and coordination with the local utility company.

Maintenance of Traffic Design (Contract A): Prepared a multi-staged MOT design with over 90 plans sheets for Contract A. The MOT design included modifications to 6 miles of interstate roadway, construction of 6 miles of new interstate roadway with 2 new interchanges, and modifications to 4 miles of arterial roadways. The design included realignment of the existing freeway, modifications to ramps/ access points at 2 existing interchanges and MOT plans for 7 roadways crossings.

Transportation Management Plan (Contract A): The TMP evaluated MOT impacts to vehicular and pedestrian traffic, sequencing of construction, haul routes, impacts to/ from nearby construction projects, and impacts to emergency response. The TMP included conceptual MOT phasing, and MOT Traffic analyses to evaluate impacts due to lane closures, detours, capacity reductions due to lane shifts, lane narrowing.

Construction Management (Contract D/E): Construction inspection services for various transportation facilities for stormwater management devices, concrete field testing services as well as traffic control devices installation inspections were provided. Also provided MOT and erosion and sediment control inspection.



Bay Bridge Barrier Study Anne, Arundel County, Maryland Traffic Engineering

Maryland Transportation Authority 300 Authority Drive Baltimore, MD 21227 Planning Manager Roxane Mukai, P.E., PTOE 410-288-8484

2003



$25 $25

SWA evaluated the feasibility of implementing a permanent traffic barrier application for temporary work zones and/or contra-flow operations on the westbound span of the Bay Bridge. Traffic data was collected including traffic volumes, vehicle classifications, accident history, vehicle speeds, accident and barrier system costs, dates and duration of contra-flow and construction operations, and field observations. Examined advantages and disadvantages, cost-to-benefit, impact to incident response and bridge maintenance operations, and state-of-the practice.



Signal Timing Optimization Anne Arundel County, Maryland

Traffic Engineering Anne Arundel County Department of Public Work Bureau of Engineering 2662 Riva Road Annapolis, MD 21041 Mr. Nestor Flores 410-222-7331

2011


Firm Was / Is Responsible Traffic Data Collection

Signal Systems Operations $155 $155

Sabra, Wang & Associates, Inc. performed traffic signal optimization of ten corridors throughout Anne Arundel County, including 66 intersections. Work included the following:

• Collected intersection turning movements for multiple weekday and weekend peaks and 7-day traffic volume data • Coded and calibrated Synchro traffic models for each corridor and timing plan • Performed field studies including saturation flow, delay and queue and travel time • Performed volume balancing between intersections, calibration based on field travel time, delay and queue data • Determined network partitioning and time of day patterns • Developed optimized timing plans including cycle length, splits and offsets • Collected and evaluated ‘after’ data including traffic volumes and travel times • Performed field adjustments/fine-tuning • Documented measures of effectiveness of the optimization efforts • Unique features of this project included: • Use of short count method described in FHWA’s Signal Timing on a Shoestring to reduce data collection costs. • Development of “Holiday shopping” signal timings in the vicinity of the Annapolis Mall to be utilized between

Black Friday and Christmas • Development of school peak timings at five intersections near middle and high schools • Implementation of several advanced controller features including split-demand, stop in walk, alternate

sequencing, coordinated and actuated, alternate vehicle extension, and inhibit maximum • The project also featured the first implementation of the twice-per-cycle flashing red arrow in Maryland. This

feature greatly reduced traffic congestion during the heaviest shopping periods by reducing left turn bay spillovers.

The project was highly successful. Average travel times along the corridors were reduced by an average of 30 seconds, saving an estimated 150,000 gallons of fuel and reducing emissions by nearly 20,000 kg in the first year.



Red Light Photo Safety Program Design Services Frederick, MD Howard County, MD Prince George’s County, MD

Prepared ITS Design American Traffic Solutions 1330 W. Southern Ave, Tempe, AZ Mr. Joseph Tromba (480) 443-7000

Ongoing Entire Project

Work for Which Firm Was / Is Responsible Engineering Services

Red Light Camera Enforcement Programming $30 $30

SWA provided engineering services to prepare design plans for the ATS Red Light Camera Enforcement program at 8 intersections in various jurisdictions such as Frederick, MD; Prince George’s County , MD and Howard County, MD. SWA was responsible for:

• Coordination with Miss Utility and traffic signal agencies to obtain existing underground utility locations. • Conducting field review of the designated intersections to verify existing utilities, intersection geometry,

signal equipment locations, signs, poles and any other related equipment or features. • Preparing field sketches and associated notes to be used for reference and determining proper placement of

proposed Red Light Camera equipment. • Developing base site plans using Microstation including existing underground utilities, signal equipment

locations and pavement markings. • Design plans including the proposed Red Light Camera pole locations, detection zones, conduit and hand box

layouts and proposed sign locations. • Preparing pole installation and detection zone details. • Submission of design plans to traffic signal agencies and supporting the design through approval.



Baltimore City Signal Timing Phases 1 and 2, BC #979 Baltimore, MD

Traffic Signal Timing City of Baltimore DOT 414 N. Calvert Street Baltimore, Maryland 21202 Mr. Raj Sharma, 443-984-2158

Phase 1 - 2008 Phase 2 - 2013


Firm Was / Is Responsible Traffic Analysis

$2,300 $2,300 Traffic Data Collection

Sabra, Wang & Associates, Inc. was the lead consultant for the citywide signal timing optimization. Phase 1 was completed in 2008 and included 410 signals in the CBD and 7 major gateways. Phase 2 included 550 signals. The work included the following data collection for vehicular and pedestrian traffic counts, GPS-based travel time and delay studies, developing and calibrating Synchro and SimTraffic models for all intersections, network partitioning, meeting the City’s goal of reducing cycle lengths while increasing FDW times and WALK times and reducing travel times, working with traffic volumes up to 3,000 vph per direction and pedestrian volumes up to 1,200 persons per hour, completing optimization of 410 signals within 12 months from start work to implementation of optimized timing plans, conducting various trials with coordination and offset seeking methods to smooth transitions between timing plans, field-implementing signal timing plans using the City’s Naztec controllers and Siemens i2 Central System software , and teaching Synchro and signal timing classes to City of Baltimore staff. The Baltimore traffic signal retiming project was by far one of the largest signal optimization projects in the country. It encompassed many complex and unique scenarios and methods regarding signal timing optimization philosophies and strategies, pedestrians signal timings, cycle length selection, network partitioning, coordination analysis, queue management, calibration of the optimization model and selection of performance measures. Innovative applications included a shortcut method of optimizing signal timings for corridors that required a quick turn-around to address construction and community needs utilizing the preliminary signal timing output from the partially-constructed model; innovations in building the modeling using locally collected data, testing with the time-space diagram, and calibrating it using statistical methods to match local conditions prior to using it to generate optimized signal timings; innovative development of a Access database/ program to automate the process of calculating yellow, red, walk and flashing don’t walk times; innovation in testing new signal timings and patterns night to work out any issues or problems before AM rush hour traffic; and innovations in application of optimization methodologies for the downtown-grid using a utility index. The City’s goal of reducing delays by 15% was far exceeded -reaching over a 30% reduction in delays, for a total of over 3 Million hours saved per year! It also resulted in 10% fuel savings, and a reduction of nearly 300,000 kilograms of harmful emissions. Benefits analyses showed that the project paid for itself within the first month and resulted in an annual benefit of $10 Million in fuel savings alone. The benefit-to-cost ratio was 33:1, meaning that for every $1 invested in the project, the public gained $33 in benefits due to travel time savings, fuel savings, etc. The project not only resulted in a more efficient transportation system, but made efficient use of funds due to the unique methods and strategies applied. So much so that the City added a one-year, no-cost, time extension to the contract to add nearly 100 additional traffic signals into the project.



City of Baltimore Signal Controller Replacement Design, Construction Management Inspection, and Central Computer/Software Integration Contract No. 880

Tech. Specs. for Signal Electronics

City of Baltimore Department of Transportation 417 E. Fayette Street Baltimore, Maryland 21201 Mr. Raj Sharma 443-984-215

2008



Traffic Signal Design

Signal & Communications Design

CCTV & VMS Design

Technology Assessments

$750 $480 Signal Timing

Traffic Engineering Studies Sabra, Wang & Associates, Inc. (SWA) provided a multitude of traffic engineering, planning and design services for the upgrade of the signal systems, which is currently in operation and controlling 960 signals in the City.

Traffic Signal System: SWA provided functional specifications to replace 1300 signal controllers in the City; construction plans and specifications to replace 17 communication hubs; technical specs to replace the existing Transportation Management Center; technical specs for a professional services contract for system integration to replace the signal syste m hardware and software including electronic test equipment and test procedures; and construction management and inspection services for the replacement of signal controllers.

Transportation Management Center: SWA performed TMC planning, procurement and central signal system integration. Under the construction management services, SWA was responsible for the day-to-day reporting of construction activities, preparing daily inspection reports, reviewing and approving invoices on behalf of City staff, representing the City of Baltimore at meetings with Contractors, acting as a liaison between City agencies and Contractors, and coordinating and conducting progress meetings with contractors and City of Baltimore Managers and subordinates.

On-Site Support: Provided o n-site support staff (Structural Engineer, Construction Engineer, and Construction Manager) during the course of the TMC construction.

Traffic Signal Design: SWA also prepared traffic signal design plans for the York / Lake and York / Gittings signal reconstruction projects in coordination with an SHA project. The design work was prepared according to City specifications and standards, and included base plans, survey, design layout, specifications and estimates.

CCTV Design: SWA prepared CCTV camera site design for five locations including siting analysis, specifications, design plans and cost estimates.

Traffic Engineering Studies: Evaluated intersection traffic volumes, pedestrian behavior, signal timings, pavement markings, signing, parking, and crash data. Recommended improvements to reduce congestion, increase pedestrian and vehicular safety. Projects included Falls Road at 36th Street and Caton Avenue at Wilkens Avenue.

Training: Performed training classes for City staff on Synchro software.



Charles Street Rehabilitation from 25th to University Project No. 814 Baltimore, MD

Traffic Studies City of Baltimore Department of Transportation 417 E. Fayette Street Baltimore, Maryland 21201 Mr. Bimal Devkota 410-396-6915

2014


Firm Was / Is Responsible Traffic Engineering

Utility Engineering $2,500 $700

Roadway Engineering Design

Sabra, Wang & Associates, Inc. (SWA), as a subconsultant, led the traffic engineering design, including traffic engineering analysis, and preparation of utility design and roadway design for the $25 Million rehabilitation of 1+ miles of Charles Street adjacent to Johns Hopkins University. SWA was responsible for the following:

• 9 Ultimate Traffic Signal Reconstructions and 4 Temporary Traffic Signal Design • Maintenance of Traffic Design for a complete full-depth reconstruction • Traffic Signal Interconnect Design • Traffic Studies, including Synchro evaluation of the conversion of Charles Street from one-way to two-way operations, MOT traffic analyses, forecasting traffic volumes,

developing lane configurations, phasing and lane assignments • Signing and Pavement Marking design, including floating bike lane signing and markings, and bike wayfinding signing • Roadway design, including roadway profiles and cross sections • Utility design of irrigation sleeves and utility composite plans • Lighting design, including special lighting for Public Art in the Plaza area, decorative and roadway street lighting • Participation in Public meetings to address MOT during construction, and traffic and lighting concerns with elected officials, JHU, residents and local businesses

The project included developing MOT plans with consideration to maintaining a safe passage through the work zone to accommodate a major pedestrian crossing of 14,000 students per day across Charles Street, maintenance of residential permit parking during all stages of construction, and conversion of Charles Street from one-way to two-way operations, developing lighting design for the Plaza, traffic signal phasing during construction and sequence of operations with the adjacent service road.



Preston Gardens/ St. Paul Place Transportation Enhancement Application/ Engineering Design Services, BCDOT Project No. 1060 Baltimore, MD

Traffic Engineering Design City of Baltimore Department of Transportation 417 E. Fayette Street Baltimore, Maryland 21201 Mr. Michael Wilmore, P.E. 410-396-6913

2013



Unknown $70

Sabra, Wang & Associates, Inc. (SWA), as a subconsultant, led the traffic engineering design, including temporary and ultimate traffic signal design, signing and pavement marking design for the multimillion dollar rehabilitation of Preston Gardens park in the heart of downtown Baltimore. SWA was responsible for the following: • Two Traffic Signal Reconstructions, one APS upgrade

and one Temporary Traffic Signal Design • Traffic Signal Interconnect Design to rewire the interconnect

for the three signals • Signing and Pavement Marking design Challenges of this project included developing a signal layout to accommodate the tight spacing in the urban area and to avoid the underground utility conflicts; developing a MOT signal in order to install a signal pole at the same location of the existing signal pole, coordinating with the highway design to prepare ADA ramp design to work with the ADA compliant pedestrian signal design while avoiding the conflicts with the underground utility and the proposed drainage/landscaping design, and coordinating with City Signal Shop to identify existing interconnect route and the signal power feed.



Urgent Need Storm Water Engineering Services Contract No. BC 1086M Baltimore City, MD

Traffic Engineering Design Baltimore City DPW 600 Abel Wolman Municipal Building Baltimore, MD 21202 Mr. Azzam Ahmad 410-396-4700

2012


Firm Was / Is Responsible MOT

Emergency Response Services $150 $27

Sabra, Wang & Associates, Inc. (SWA), as a subconsultant, led the traffic engineering design, including temporary and ultimate traffic signal design, signing and pavement marking design for the multimillion dollar rehabilitation of Preston Gardens park in the heart of downtown Baltimore. SWA was responsible for the following: • Two Traffic Signal Reconstructions, one APS upgrade

and one Temporary Traffic Signal Design • Traffic Signal Interconnect Design to rewire the interconnect

for the three signals • Signing and Pavement Marking design Challenges of this project included developing a signal layout to accommodate the tight spacing in the urban area and to avoid the underground utility conflicts; developing a MOT signal in order to install a signal pole at the same location of the existing signal pole, coordinating with the highway design to prepare ADA ramp design to work with the ADA compliant pedestrian signal design while avoiding the conflicts with the underground utility and the proposed drainage/landscaping design, and coordinating with City Signal Shop to identify existing interconnect route and the signal power feed.



Master ITS Communications Plan Contract No. DCKA-02010-T-0080 Washington, DC

ITS District of Columbia, DOT 55 M Street, SE, Suite 400 Washington, DC 20003 Mr. Wasim Raja 202-671-2656

2013 Entire Project

Work for Which Firm Was / Is Responsible

Data Collection

GIS Inventory / Database

Cost Estimates $520 $520

Sabra, Wang & Associates, Inc. (SWA), in cooperation with subconsultants, is among the leading key players that developed the District’s on-going ITS Communications Plan. This plan provides a blue print and a road map for the integration of the existing and future communications infrastructure that will ultimately support the City’s 1600 signals, CCTVs, DMSs, detectors, data collection stations, emergency evacuation routes, HAR stations, bicycle detection stations, overhead detection devices, weather sensor stations, traffic monitoring stations and flow data from INRIX data, connection with RITIS, multiple transportation management centers, centralized adaptive signal control, wireless ITS devices, and other supporting devices. Work included the following:

• Inventory of DDOT’s communications infrastructure and ITS devices including existing twisted pair, wireless, DSL and fiber network in I-295, Center-to-Center Connections at the Reeve’s center, tunnel control room, HSEMA, 55 M Street signal system room, EMA Room, SOC center at 3rd St. and Indiana Avenue, snow emergency center at 14th St. and U St., DCNET, and DDOT Enterprise Networks

• Meeting with stakeholders (DDOT, DCNET, Tunnels Control, HSEMA, DCNET, OCTO, and general stakeholders) to discuss existing resources and issues, and coordinate the development of the ITS Communications Master Plan

• Prepared existing inventory report, developed GIS database, and populated existing resources and all future devices

• Performed communications bandwidth analysis taking into consideration existing and proposed ITS devices and hybrid communications alternatives, center-to-center connections, and connections with partner systems such as RITS, MD CHART, CAPWIN, and VA PSTOC

• Develop phased deployments and cost estimates for the ITS Communications Master Plan • Developed a preliminary communications design plan with a high level network topology,

communications schematic diagrams for various hybrid solutions, and cost estimates for mixed media options, phased hybrid solutions and leveraging DCNET fiber enterprise

•



Citywide Traffic Signal Retiming Contract No. DCKA-2011-Q-0052 Washington, DC

Signal Timing Optimization

District of Columbia, DOT 55 M Street, SE, Suite 400 Washington, DC 20003 Mr. Wasim Raja 202-671-2656

2015



Data Collection

Traffic Operations and Analysis

Pedestrian Clearance Interval Eval.

$6,000 $6,000 Modeling / GIS Database

Vehicle Clearance Interval Eval.

Sabra, Wang & Associates, Inc. (SWA) was the lead consultant for the citywide signal timing optimization of all 1,600+ signalized intersections within the District of Columbia. The Southeast/Southwest network was completed in 2014 and included 200 signals.

• Data collection for vehicular, pedestrian and bicycle counts • Before and After GPS-based Travel time and delay studies • Geometric inventory of each intersection • Design and development of an on-line GIS database of signalized intersections with links to PDFs of traffic counts and signal timings for data

sharing among DDOT and the SWA Team • Development of DDOT vehicular and pedestrian clearance interval calculation standards • Analysis and update of all Y, AR, W and FDW clearance intervals to meet 2009 MUTCD standards • Software development to automate the clearance interval calculation process and display print-outs of intersection distance measurements

and phase assignments for record-keeping • Signal controller firmware conversion from 215 Interval to 233 Phase prior to optimization • Development of DDOT Traffic Signal (TS) Drawing and Dial Sheet standards. • Design and update of all TS Drawings and Dial Sheets • Sy • Signing, pavement marking and signal design improvements at critical intersections • Quick optimization and evaluation of 120 intersections along critical commuter corridors • Development of optimized signal timing plans for 5 patterns: AM, Midday, PM, Nighttime and Weekend • Field implementation of signal timing plans using the City’s 170 controllers and QuicNet Central System software • Fine tuning and field adjustment of optimized signal timing plans

Challenges in this project included conversion of the existing interval based timings to phase based timings and updating vehicle and pedestrian clearance timings with minimal impacts to pre-optimization operations. Complex interval operations were often simplified or streamlined to be safer and more versatile.

“Before” and “After” studies of the work completed to date have shown considerable benefits to drivers, bus riders and pedestrians. Vehicle travel times within the first network of 200 intersections reduced by an average of 13%; delays reduced by over 30% and the number of stops reduced by 25%. The overall benefit-cost ratio was 77:1 with an annual monetary benefit of $51 million. Analysis of metro bus stop data showed that the number of buses running behind schedule decreased by over 40%. Quick optimization results showed reduced travel times and queues.



Federal Highway Administration, SBIR2, Signal Operations Expert System Contract No. DTRT57-11-C-10045

Synchro and VISSIM Analysis Intelligent Automation, Inc. 15400 Calhoun Drive, Suite 400 Rockville, Maryland 20855 Mr. Mark James (301) 294-5221

2014


Firm Was / Is Responsible Incident Management

Signal Timing $200 $96

Research

Sabra, Wang & Associates, Inc. (SWA) under task to Intelligent Automation, Inc. provided the following efforts related to the development of a “signal operations expert system” tool that would assist Traffic Management Centers and signal operations managers in the detection of traffic incidents and anomalies and the development and implementation of measures to mitigate their impacts. Work efforts included the following: • Assisted in identifying the overall system architecture, concept of operations, system components, TMC

applications and system interface • Identified signal timing and traffic incident scenarios and provided example traffic data for analysis • Selected a representative traffic network, generated traffic data based on the combinations of conditions

such as: locations, number of lanes blocked, lane groups, duration of incident, traffic demand and signal operations

• Provided operational knowledge on identifying the type, location, and cause of traffic incidents, and assisted in the development of rules in the expert system software toll

• Provided response solutions for mitigating the incident impacts • Provided assistance with simulations and interpretation of simulation outputs for performance evaluation

on the developed signal operations expert system toll • Identified measures of effectiveness, displays and thresholds for various measures of effectiveness

applications • Developed UTDF formats so that MOE data can be extracted directly from signal timing analysis tools such

as Synchro • BETA tested and evaluated the expert system tool and provided recommendations for

refinement/improvement • Assisted IAI in understanding the TMC operator’s concerns, experiences, and operational procedures

through meetings and TMC visits • Provided final technical report to summarize the technical research/development of the expert system and

assisted in the final demonstration to FHWA



FHWA Task Order Assignment in Traffic Signal Timing, Various Contracts

Traffic Signal Timing Federal Highway Administration 6300 Georgetown Pike McLean, VA 22101 Mr. Ghaman, P.E , Mr. Curtis, P.E., | Mr. Huang, P.E. (202) 493-3270, 3484

Ongoing



Optimization Research $1,000 $500

Signal Timing Process: This report defines the entire signal timing process, where progress has been made, and specific areas where additional research may be needed. The report identifies five distinct procedures (Optimization, Deployment, Evaluation, Data Management, and Documentation) associated with the signal timing process. Each of these procedures is examined and evaluated. Signal Timing on a Shoestring: This report examines various cost-effective techniques that can be used to generate good signal timing plans that can be employed when there are insufficient financial resources to generate the plans using conventional techniques. The report identifies a general, eight- step process that leads to new signal plans: 1) Identify System Intersections; 2) Collect and Organize Existing Data; 3) Conduct a Site Survey; 4) Obtain Turning Movement Data; 5) Calculate Local Timing Parameters; 6) Identify Signal Groupings; 7) Calculate Coordination Parameters; and 8) Install and Evaluate New Plans. The report develops a “tool box” of procedures and provides examples of how the tool box can be used when there is a moderate signal timing budget, when there is a modest signal timing budget, and when there is a minimum signal timing budget. Regional Traffic Signal Management Program Workshops: A Regional Traffic Signal Management Program (RTSMP) is a comprehensive plan that encompass the overriding philosophy, policies, and objectives that dictate how traffic signal systems are designed, operated, maintained, and funded in a region. SWA is under contract to facilitate (RTSMP) Workshops throughout the country. SWA recently facilitated a 2-day workshop in Atlanta, GA. The workshop consisted of interviews with 12 separate agencies on their signal timing processes, including agency interviews, site visits and preparation of a final report with recommendations. Balancing Safety and Capacity in an Adaptive Signal Control System: This research focuses on the development of real-time signal timing methodologies and algorithms that balance safety and efficiency. The research consists of two phases; phase 2 is completed. Phase 1 examined the relationships between signal timing and surrogate measures of safety: frequency of rear-end, angle, and lane-change conflicts. The Federal Highway Administration (FHWA) Surrogate Safety Assessment Methodology (SSAM) was used to evaluate simulated scenarios to test the relationships between signal timing parameters and the occurrence of traffic conflicts. The report concludes with the development of a multiobjective optimization methodology and the five principle algorithms that constitute the proposed adaptive system for tuning the cycle. Expert System Traffic Signal Timing Tool: This project will develop a knowledge-based traffic signal expert system, for analysis and optimization of traffic signal timing. The proposed methodology integrates state-of-the-art traffic data prediction and incident detection algorithms to generate cycle-based traffic demands and incident alarms for operator’s confirmation. The rule-based expert system consists of traffic experts’ knowledge and experience of solving signal operation problems caused by recurrent or non-recurrent congestion. The expert system will be able to assist operators to respond effectively and efficiently in the traffic management center (TMC). ACS Lite Evaluation: The ACS Lite software is a tool for optimization of traffic signal timing splits and offsets in a ‘real time’ mode of operation. The software monitors traffic volumes in real-time and issues commands, on a cycle-by-cycle basis, to the controller to adjust splits and offsets for optimum operations. The ACS Lite is designed for retrofit to existing Closed Loop Signal Systems without having to change controllers, communication media and other devices. The system is designed for small to medium cities where the existing systems are neither obsolete nor state-of-the-art. SWA was responsible for assessing the benefits of ACS Lite technologies. SWA collected ‘before’ and ‘after’ traffic data on four arterials in Texas, Ohio, California and Florida, performed ‘before’ and ‘after’ floating car travel time and delay studies and analyzed statistical measures on ‘before’ and ‘after’ traffic volumes, speed and travel time and delay data to compare existing and optimized signal timings. Data was aggregated for total travel time, control delay time, and stopped delay time by approach and by day and a benefit-cost analysis was performed using the field collected data. SWA coordinated with local DOT staff and vendors including Seimens, PEEK, McCain, Econolite and Eagle. SWA prepared final reports including graphical presentations of the statistical mean, median, standard deviation, range, and skew.



On-Call Traffic Engineering Howard County, MD

Traffic Engineering Design Howard County DPW 9250 Bendix Road Columbia, MD 21045 Kris Jagarapu, Traffic Division Chief, 410-313-5450

PA1292014: 2014-2017; BID2008-12:

2008-2014 CA05: 2004-2008

CA02-13: 2001-2005


Firm Was / Is Responsible Traffic Data Collection

Traffic Calming / Studies $1,718 $1,718

Transportation Planning

Sabra, Wang & Associates, Inc. under 4 successive, repeated traffic engineering on-call contracts with the County since 2001 has performed a multitude of traffic engineering and transportation planning projects. SWA has performed the following tasks within the past 10 years: • Traffic Signal Timing Optimization along 3 signals on Columbia Gateway Dr., and 7 signals on Little Patuxent Parkway, including traffic data collection, travel time and delay studies,

field observations, development of Synchro models, development of optimized signal timing plans for 3 peak periods, assisting the County with hands-on controller programming and troubleshooting, assisting the County with field implementation, and before/after and benefit/ cost analyses. A unique feature of this project is the troubleshooting of the controller programming, which revealed some small programming changes that were short-timing some phases and causing peak period congestion.

• Bike Route Wayfinding Analysis & Signing Design from Clarksville to NSA, including generator/ attraction analysis, sign art design, development of plans and specifications, including fabrication details, and sign schedule.

• Columbia Town Center Traffic Impact Analysis: Building on previous SWA studies of short-term and long-term redevelopment scenarios in the Columbia Town Center area in anticipation of up to 5,000,000 square feet of new office space, 750,000 square feet of new retail space and 5,000 new residential units, developed subarea travel demand model including TAZ refinements, screenline validation and testing of roadway and transit upgrade scenarios. Presented findings to public at community-wide forum. Developed a transportation master plan to assist County in developing roadway and transit improvements and assisted County in reviewing new APFO requirements for traffic studies and mitigation for Downtown Columbia.

• Snowden River Parkway Corridor Study: SWA performed a comprehensive assessment of short-term and long-term traffic operations between MD 32 and MD 100 along Broken Land Parkway and Snowden River Parkway. Documented existing roadway network, compiled baseline traffic volumes for 22 intersections and 2 interchanges, performed existing capacity and level of service calculations, and identified existing network deficiencies. Performed development impact analysis from approved pipeline developments including trip generation, trip distribution, modal split and route assignment. Identify existing, short-term and long-term roadway, intersection, interchange, bicycle and transit capital improvements to meet projected travel demand

• Bus Rapid Transit Analysis: SWA performed a detailed analysis for the implementation of a five-corridor BRT system. Tasks included: documentation of existing corridor characteristics, transit ridership, intermodal nodes ; validation of a base year countywide travel demand model; refinement of BRT alignments and stations; development of line and station forecasts; sensitivity analysis of year 2035 person throughput, Build vs. No Build AADT and auto vs. transit travel times.

• Traffic Data Collection: SWA performed intersection turning movement and multiday volume counts for 10+ locations including Columbia Gateway Corporate Park, Columbia Town Center, US 1 at Selnick Drive Extended/ Route 100 Industrial Park, Snowden River Parkway/ Dobbin Road, and the MD 108/ Clarksville Bypass.

• Intersection Traffic Operations Studies including data collection, sight distance, auxiliary lane needs, queuing analysis, traffic forecasts, signal warrants, roundabout analysis, capacity analysis, simulation and conceptual roundabout and geometric designs including alignments, hydraulic analysis, cost estimates and typical sections for the following capital improvement projects: Ten Oaks Road at Brighton Dam Road; Centre Park Drive at Columbia 100; College Ave at Doncaster Drive; Harding Road at Scotts Landing Road; Volmerhousen Road at Guilford Road; Oakland Mills Road at Guilford Road; Vollmerhausen Road at Guilford Road; Port Capital Drive at New Colony Blvd

• Lighting Analysis: SWA performed LED Light illumination analysis and verification measurements at various locations countywide, including Snowden River Parkway south of McGaw Road.



I-95 Express Toll Lanes Traffic Engineering Design and Planning Contracts KH 1501, KH 1502, KH 1503, KH 1401, KH 1402, KH 1403, KH 1301, and KH 1302

CCTV / DMS / Signal / Design Maryland Transportation Authority (MDTA) 300 Authority Drive Baltimore, MD 21222 Mr. Dave Labella, P.E. 410-537-7848

2014



Fiber Communication Design

Signing

Pavement Marking

Unknown $3,200 Lighting Design

Traffic Analyses / Modeling

SWA prepared a multitude of traffic engineering design and traffic analysis for the reconstruction of 11 miles and 5 interchanges on I-95 to provide Express Toll Lanes. Signing Concept Plans. SWA prepared the signing concept plans for I-95 section, which consist of 11 miles of highway (I-95) and 5 interchanges with both general purpose and managed (toll) travel lanes. The work included inventory and evaluation of existing signing, development of 24 base plans, development of conceptual layouts, meeting with MdTA and the GEC to refine the concepts, develop of final plans include sign size layout, detailed location design and support type selection. The plans were developed to a50% completion state and handed over to the segment designers for incorporation into the final plans. • I-95 Final Design and MD 43 Interchange Final Design Contracts (KH 1401, 1402 and 1403). SWA prepared interchange selection and alternative traffic LOS and simulation

analyses for the MD 43 at I-95 ultimate and interim interchange configurations. SWA prepared interchange signing and marking (over 50 plan sheets), lighting, traffic signalization and interconnect (3 ultimate signals and 6 temporary signals) and ITS (10 DMS signs, 5 CCTV Cameras, 2 Automatic Traffic Recorders, 7 Toll Rate Signs and for preparing details for conduit layout for ITS devices on 5 Toll Gantries) design. Prepared lighting designs for all three contracts. Photometric analysis including point by point calculations on the proposed pavement surface, light trespass calculations, and veiling luminance calculations. The project included lighting for 1 interchange, continuous lighting along general purpose and managed lanes, underpass lighting, and sign lighting throughout the project limits.

• I-95 at I-895 Interchange Final Design Contracts (KH 1501, 1502 and 1503): SWA prepared traffic signalization design for 2 Baltimore City intersections and ITS design. The ITS designs included 8 DMS signs, 5 CCTV Cameras, 2 Automatic Traffic Recorders, 2 HARs, 2 Over Height Vehicle Detection Systems, 4 Toll Rate Signs, 4 Travel and Toll Information Signs, Power and Communications to 2 Automatic Gate Controllers, and Power and Communications to 2 Toll Gantries. In addition, SWA also developed the ITS standards, special provisions, and stru ctural design and mounting details. SWA is also responsible for all sighting analysis of all CCTV, DMSs, RWIS, and HARs designed under these contracts including coordination with various utility companies including electrical, telephone and fiber optic.

• Corridor-Wide Traffic Analyses: SWA performed Highway Capacity Manual analyses for the IAPA report. Analysis time periods were the weekday AM and PM peak periods and included Basic Freeway Segments, Weaving, and Ramps. SWA was also responsible for the preparation of a VISSIM model of the proposed geometrics of I-95 Section 100. The simulation models consisted of 8 interchanges and over 15 miles of interstate highways. The simulation was prepared for 2025 Build conditions and 2010 Build and No-Build conditions. CORSIM models were also developed to double check the results of the VISSIM analyses.



On-Call Traffic Engineering Design BCS 2008-05A

Traffic Engineering Studies Maryland State Highway Administration Office of Traffic and Safety 7491 Connelley Drive Hanover, Maryland 21076 Mr. Michael Paylor | 410-787-4027

2016



Traffic Signal Design $7,000 $3,725

Lighting Design

SWA has prepared over 90 task assignments on these contracts. Work has included the following:

Preparation of traffic engineering design plans for area wide (on-call) contractors and as inserts into major highway design projects such as traffic signal design, signing and pavement marking, lighting, signal interconnect and signal system design, on-site support, studies, ITS and Maintenance of Traffic design.

Traffic Signal Design, 38 Assignments: Signal design assignments consisted of preparing traffic signal reconstruction, new traffic signal or signal modification plans such as pedestrian upgrades, LED upgrades, or phase changes. Signal design plans included preparation of base plans, as-builts of existing equipment including conduit capacities and equipment condition assessments, utility height measurements, identification of power source and coordination with the local utility companies, and preparation of signal designs and cost estimates. Signal design projects often included minor geometric improvements such as channelization, median adjustments, signing modifications, and ADA sidewalk ramp upgrades.

Traffic Engineering Design for Highway Improvement Projects, 12 Assignments: Prepared traffic signal and interconnect design for ultimate and temporary conditions. Coordinated with the MOT plans for temporary signal pole and interconnect placement. Prepared signing and marking and lighting plans for ultimate conditions. Prepared MOT plans. Attended project coordination meetings at SHA Office of Highway Design. Coordinated with highway, drainage, utility, E&S, structural designers / consultants, various SHA divisions, federal, county, and municipal agencies. Prepared plans, quantities and cost estimates for multiple reviews (typically 65%, 95%, and 100%). Sample projects include the MD 4 at Suitland Parkway Interchange, MD 2 at Mt. Harmony Road and MD 4 at MD 235 Intersection Improvement Projects, and MD 175 at Snowden River Parkway Park and Ride Expansion.

Lighting Design, 14 Assignments: Preparation of intersection and interchange lighting plans including field inventory, base plan preparation, photometric analysis (including tunnel analysis) voltage drop, connector kits, layout of poles, arms, conduits, quantities, cost and specs. Sample projects include I-68 Interchange in Cumberland, 4 interchanges along I-270 and I-70, and several intersection lighting projects.

ITS Designs, On-Site Traffic Engineering Support, Computer Programming / IT, Technology Assessments, 22 Assignments: Sample projects include DMS sign plan preparation, UPS / BBS As-Builts, LED Inspection Program, STAR projects (no plan preparation, verbally direct contractor in work), CCTV camera design, and the design of a wireless communication system.



Susquehanna River Crossing Toll Plazas, Cecil County, Maryland Traffic Engineering

Maryland Transportation Authority 300 Authority Drive Baltimore, MD 21227 Roxane Mukai, P.E., PTOE Planning Manager | 410-288-8484

2005



$150 $60

SWA, as a subconsultant, developed a traffic simulation model to evaluate improvements to the Susquehanna River toll plazas. Studies included:

• Field data collection of toll processing rates, queues, and speeds • Analysis of plaza capacity • Validation and calibration of traffic model • Determination of optimal toll plaza configuration (electronic, cash, ticket) • Evaluation of future traffic volumes and EZPASS market share including

commuter and holiday peak time periods • Development of conceptual geometry including signing and pavement

markings for proposed improvements