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Columbus ComputerizedTraffic Signal System
Eagan L. Foster, P.E.Transportation Division
Columbus Public Service Department
Where have we been?
Where are we today?
Where are we going?
Columbus ComputerizedTraffic Signal System
• The Importance of Coordinated Traffic Signal Systems– Reduce congestion
– Reduce accidents
– Reduce aggressive driver behavior
– Improve air quality / reduce fuel consumption
– Postpone or eliminate the need for construction of additional capacity
– Neighborhood traffic calming
Columbus ComputerizedTraffic Signal System
• Columbus’s Coordinated Traffic Signal System– Late 1950’s
– First capture of Federal monies
• Civil Defense funding
– Electromechanical controllers
– “Open Loop” system
– Cross-jurisdictional coordination in Bexley
Columbus ComputerizedTraffic Signal System
• Columbus looked to improve the signal operations in the Central Business District– Early 1970’s
– Federal money - TOPICS (Traffic Operations Program to Improve Capacity and Safety)
– Central Control System
– Coaxial Cable Interconnect and conduit
– Closed-circuit Cameras - funding
– Set model for development of future projects
Columbus ComputerizedTraffic Signal System
• Columbus looked for an opportunity to capture additional funding for another signal system in the Northland area– Federal money - Demonstration program
– Central Control System at Karl & Morse
– System monitored from downtown office
– Coaxial Cable Interconnect - aerial installation
– City installed field devices by force account
Columbus ComputerizedTraffic Signal System
• Columbus developed a project to replace the CBD system with a system capable of handling all the traffic signals (up to 1000) in Columbus and those in other jurisdictions– Early 1980’s
– To be constructed in two phases
– Federal funding
• Congestion Mitigation & Air Quality (CMAQ)
– Replace the existing CBD system
– Replace the 1950’s electromechanical system
Columbus ComputerizedTraffic Signal System
Phase 10 is under construction• Local intersection equipment installed – Summer 2002• Communications plant
– Installation delayed due to utility rearrangement issues• Process changed three times during the project - adding 3
years to the project• Additional costs to the City• Now underway since June 2004
Columbus ComputerizedTraffic Signal System
Upcoming projects• Phase 11
– Final Tracings filed in September 2003– Was programmed for sale in January 2006
• Phase 12– Design
• Consultant for project plan preparation
• Design parameters changing due to CTSS study
Columbus ComputerizedTraffic Signal System
Upcoming projects• Phase 13 and Phase 14 proposed to begin replacement of
portions of the system– Communications infrastructure dates to 1985
• New technology possible
– Fiber-optic
– Wireless
– Replace Central Control System
• Transition plan for using coaxial cable
• System capable of interacting with other systems
Columbus ComputerizedTraffic Signal System
Closed Loop Systems• City proposed the first centrally-monitored Closed Loop
Traffic Signal System
• Federal-aid project sold in 1981
• Safetran Traffic Systems
• Locations– Hamilton Road
– Refugee Road
– Henderson Road
Columbus ComputerizedTraffic Signal System
Closed Loop Systems• Later
– Econolite– TCT (Traffic Control Technologies)
• Current standard– Econolite Zone Master
• Local communications– Twisted pair wire or fiber optic generally being used– Wireless –Hamilton Rd (SR-317 near US-33)
– Eagle Actra Master• Local communications – wireless• Partnership with ODOT District Six
Polaris Pkwy
Polaris Pkwy
Columbus ComputerizedTraffic Signal System
New Signal Control / Management System should have the following characteristics– Open Architecture
– Interoperable with Other Planned Regional ITS Initiatives
– Leverage the City’s Existing Infrastructure• Compatible with current controllers
• Operate over coaxial communications media
Columbus ComputerizedTraffic Signal System
Columbus’s relationship to other agencies• Lead agency for coordination through CTSS
– Interconnect Design
– Operations
• Monitoring Of Signals On The CTSS
– Advise Agency Of Status Of Operation
• Timing In Other Jurisdictions
– Responsibility Of The Other Agency
– City Implements Timing On The System
Columbus ComputerizedTraffic Signal System
Columbus’s relationship to other agencies• Lead agency for coordination through CTSS
– Maintenance
• Communications Infrastructure
• Control Cabinet Communication Equipment
– Agencies
• Current - Bexley, Franklin County, Grandview Heights, Reynoldsburg, Valleyview, Whitehall
• Groveport, ODOT (Closed Loop)
• Future - Marble Cliff, Upper Arlington
Columbus ComputerizedTraffic Signal System
Columbus’s relationship to other agencies• Cooperative incident management with ODOT - Freeway
Management System– Co-location with FMS in the City’s Traffic Management Center
– Connection to Econolite Closed Loop System at Polaris Parkway
– Future connection to other signal control systems
Columbus ComputerizedTraffic Signal System
Columbus’s relationship to other agencies• Cooperative cross-jurisdictional signal coordination
– ODOT maintaining communications equipment for their signals and City signals in corridors
• US-62/SR-3 between I-270 and Brown Road
• SR-3 between Agler Road and Dempsey Road
• US-33 between Nottingham Road and Riverside Green
– Franklin County
• Cleveland Avenue between Oakland Park and Ferris Road
Columbus ComputerizedTraffic Signal System
Columbus’s relationship to other agencies• General Maintenance Operations
– Agencies
• Columbus Airport Authority
• Grandview Heights
• Marble Cliff
• Ohio State University
• Valleyview
• Whitehall
Columbus ComputerizedTraffic Signal System
Columbus CTSS Study• MORPC contract• Key Agencies - Financial Contribution - $20K each
– City of Columbus– Franklin County Engineer– Central Ohio Transit Authority
• Consultant Team– HNTB
• Dave Hill, Project Manager, Arlington Virginia– DLZ, Ohio
• Steve Jewell, Assistant Project Manager, Columbus
Columbus ComputerizedTraffic Signal System
Columbus CTSS Study – Final Draft Received• Control & Communication Recommendations
– Replace Central Control System with a more Distributed System– Utilize existing coax for IP Communications– Utilize existing Eagle and Econolite Controllers to extend possible– Construct a new Communications Network
• IP Communications Protocol• Fiber-optic SONET Rings – Resilient Packet Rings• Wireless Communications to local devices
EXHIBIT 6: COMMUNICATION SYSTEM BLOCK DIAGRAM
NOTES
NEW CENTRAL SIGNAL COMPUTER2
2. NEW COMPUTER ASSUMED TO BE CAPABLE OF COMMUNICATING WITH EAGLE, ECONOLITE,AND NTCIP CONTROLLERS
EXISTING VIDEOSWITCH
RFMODEM3
3. MODEMS MUST WORK ON AT LEAST 4 COMMUNICATION CHANNELS, ONE EACH FOR EAGLE, ECONOLITE,AND NTCIP SIGNAL CONTROLLERS, AND FOR EXISTING CAMERA CONTROLLERS
NTCIP CAMERACOMPUTER4
4. NTCIP CAMERA COMPUTER SENDS CAMERA AIMING COMMANDS AND DISTRIBUTES DIGITAL VIDEO TOVIEWERS
RFMODEM3
RFMODEM3
RFMODEM3
EIA-232EIA-232EIA-232EIA-232
RF SPLITTER/COMBINER
EAGLE
RFMODEM3
EIA-232
ECONOLITE
RFMODEM3
EIA-232
NTCIP
RFMODEM3
EIA-232
RFMODEM3
ANALOG VIDEOTRANSMITTER
ANALOG VIDEORECEIVER
ETHERNET
RPR HUB6
SECURITYAPPLIANCE
ETHERNET
EXISTINGCOAX
METRO-NET SECURITY
APPLIANCE
MEDIACONVERTER
5. DEVICE SERVER NOT REQUIRED IF CONTROLLER HAS ETHERNET PORT
ETHERNET
ETHERNET
DISTRIBUTIONFIBER
6. ETHERNET SWITCHES AND RPR HUBS WILL BE EQUIPPED WITH FIBER OPTIC INTERFACES AS REQUIRED.
ETHERNETSWITCH6
NTCIP
EIA-232
ETHERNETSWITCH6
DEVICESERVER5
MPEG-2CODEC
DEVICESERVER5
RFMODEM3
DEVICESERVER5
MEDIACONVERTER
ETHERNET
DISTRIBUTIONFIBER
ETHERNETSWITCH6
NTCIP
EIA-232DEVICESERVER5
NTCIP
EIA-232 DEVICESERVER5
ETHERNET
TMC
RPR HUB6 BACKBONEFIBER
DIST.FIBER
BACKBONEFIBER
1. SHADED ITEMS ARE EXISTING. UNSHADED ITEMS ARE NEW.
Columbus ComputerizedTraffic Signal
System
Columbus ComputerizedTraffic Signal
System
EXHIBIT 1: PROPOSED BACKBONE RINGS
FIBER INSTALLED FOR BACKBONE
SPARE FIBER IN METRONET CABLE (APPROXIMATE LOCATION)
Proposed Communications
Network Backbone
Columbus ComputerizedTraffic Signal
System
Proposed Communications
Network
Redesign of Phase 11 Project
FIBER INSTALLED FOR BACKBONE
SPARE FIBER IN METRONET CABLE (APPROXIMATE LOCATION)
EXHIBIT 7: BACKBONE RINGS NEAR PHASE 11
HUB
14 SIGNALSAND A CAMERA.
SEE EXHIBIT 8.
CLOSED LOOPSYSTEM ONTWISTED PAIR,PLUS OTHERSIGNALS
CLOSED LOOPSYSTEM ONFIBER
ABOUT 10SIGNALS
AT LEAST3 SIGNALS
14 SIGNALS.SEE EXHIBIT 11
12 SIGNALS.SEE EXHIBIT 10
9 SIGNALS AND2 CAMERAS.
SEE EXHIBIT 11
11 SIGNALS.SEE EXHIBIT 12
Columbus ComputerizedTraffic Signal SystemEXHIBIT 11: KING/FIFTH/GRANDVIEW/NORTHWEST/DUBLIN/MCKINLEY/RIVERSIDE
RADIO ZONES
MICROWAVEVIDEO LINKS
HUB AT ON BACKBONEFIBER AT POLICE STRATEGIC
RESPONSE UNIT
HUB ONBACKBONE FIBER
DISTRIBUTIONFIBER
Columbus ComputerizedTraffic Signal System
Columbus CTSS Study – Final Draft Received• Other Recommendations
– Timing Plan Development• Key to Success of CTSS• $2,500 to $3,000 per intersection typical (by consultant)
– Staffing• Engineering & Data Collection
– 75 signals per staff member» (increase from around 150 per staff member
• Maintenance– 60 signals per technician
» (increase from around 75 per tech)
Columbus ComputerizedTraffic Signal System
Future Direction for CTSS Development• Have Secured Congestion Mitigation/Air Quality Funding• Planning
– Scope of Work to Include Which Features – Determine Optimum Phasing Sequence
• Phase 13 – Begin Replacement of Existing System– New Central System– IP Communication at Existing Locations
• Phase 11 – Extend System with New Communications• Phase 12 – Extend System with New Communications• Phase 14 – Communications Conversion
– Determine Optimum Funding– How Fast Can Plans Be Produced?
Columbus ComputerizedTraffic Signal System
Questions?
• Eagan L. Foster, P.E., P.T.O.ETraffic Operations Engineer
City of Columbus, Transportation Division
109 N. Front Street, Third Floor
Columbus, OH 43215-9022
(614) 645-7738