Upload
harvey-henderson
View
214
Download
0
Tags:
Embed Size (px)
Citation preview
An Intelligent Transportation System Evaluation Tool in the FSUTMS Regional Demand Modeling Environment
By
Mohammed Hadi, Florida International UniversityandVidya Mysore, FL. Department of Transportation
12th Conference on Transportation Planning Applications
May 17-21, 2009Houston, Texas
Value and Impacts of ITS Important element of the
decision making process ITS planning and
programming Choice between ITS and
other alternatives Understanding the
impacts/quantifying the benefits
Optimizing existing system operation and design
Evaluation Tool Purpose
Provides assessment of the benefits and costs associated with implementing ITS in a region
Allows the users to assess deployment options within the framework of the MPO adopted FSUTMS models
Accumulates the benefits and costs over the life-cycle duration of each of the improvement types selected by the user
Allows ranking of alternative improvements
Evaluation Approaches “Goal‑based” approach
• Does not compare expected benefit to the expected cost dollar values
“Economic approach” • Does not account for non-quantifiable
measures
Combination of approaches
IDAS
Powerful tool and used as a basis and a starting point for this development
Evaluate a large number of ITS deployments Limitations
Not consistent with the Florida calibrated models Requires manipulation of FSUTMS output files for use as
inputs to the tool Software design and GUI needs improvements Methods and some parameters need to be updated Not flexible to allow evaluating new ITS elements and
components, performance measures, etc.
FDOT Project Develop a tool and methods to perform ITS
sketch planning evaluations as part of the FSUTMS/Cube environment No need for file conversion Use calibrated regional models Flexible and extendable evaluation environment Up to date methods and parameters Powerful data handling and modeling capabilities.
State-of-the-art user interface A joint FDOT System Planning Office and FDOT
ITS Section effort.
Evaluated ITS Deployment Ramp Metering Incident Management Systems Highway Advisory Radio (HAR) and Dynamic Message Signs
(DMS) Advanced Travel Information Systems HOT Lanes Signal Control Transit Vehicle Signal Priority Emergency Vehicle Signal Priority Monitoring and Management of Fixed Route Transit Transit Information Systems Transit Security systems Transit electronic payment systems Smart work zones Road Weather Information Systems
Evaluation Tool
EvaluateITS
Benefits and Costs
ITS B
enefit Database
User
model data
benefit - d
ata
cost - dataevaluation - results
evaluation - parameters
ITS Cost database
FSUTMS Modules
adjusted parameters
Benefit Dollar Values
Performance Measures
Vehicle miles of travel (VMT); Vehicle hours of travel (VHT); Average speed; Number of accidents
Fatality Injury Property damage only
Fuel Consumption (gallons) Monetary benefits to users and/or
agency, as appropriate Emission (gm)
Hydrocarbon Carbon monoxide Oxides of Nitrogen
Assessment Elements
Performance modules (emission, fuel consumption, safety, TT)
ITS impacts ITS costs Dollar values of benefits
ITS Benefit Evaluation A method developed for each component
Review and assessment of methods used in evaluation tools
Review of literature Default ITS impact parameters derived based on
a review of previous evaluation studies, USDOT benefit database and the values used in existing ITS sketch planning tools.
The user is able to change the default ITS impact parameters and perform sensitivity analysis.
ITS Cost Evaluation The cost information includes the number and types of
equipment required for each type of evaluated ITS deployment
The cost information includes initial costs, operation and maintenance costs, estimated interest rate, and life time of each equipment
Based on information from ITS agencies collected in a previous FDOT effort and information collected in this study
User can change the defaults and is encouraged to do this based on projects at hand
Example Combined Incident Management and
DMS/HAR Evaluation
IM Evaluation Queuing analysis is used to calculate incident delays;
taking incident frequency, duration, lane blockage, and traffic demand variations into consideration
Queuing theory equations implemented for different periods of the day
Shift of fatalities to injuries as well as secondary incident savings
Evaluation of emission and fuel consumption benefits based on saving in vehicle-miles traveled in queues rather than on default reduction factors
DMS/HAR Evaluation
The evaluation of DMS and HAR is combined with incident management instead of evaluating them separately
The activation of DMS and HAR causes route diversions, which reduces the traffic volume on mainline
The increase in travel time for diverted vehicles is determined by the difference in average travel time along the mainline and that on alternative route(s) taking into consideration the average v/c ratio on alternative route and type of alternative route
4-16
Diversion Rate
0 5 10 15 20 25 30 35 40 45 50 55 60 65
0.0
0.1
0.2
0.3
0.4
0.5
Div
ersi
on
Rat
e
Delay Savings (Minutes)
Stated preference up to 60 percent of the freeway traffic to exit the freeway ahead of the bottleneck
Lower values for revealed preference
Function of a number of factors
“Boundedly Rational” switching behavior
Relationship used by Huchingson and Dudek
Diversion Rate Studies Diversion Rate Used in Evaluation
Evaluation Methodology Road Ranger Service Patrol
The savings are total annual costs of the services
provided by road ranger service patrol
Index Service COST per ActivityActivity Number
per Vehicle Mile per Year
1 Abandoned $98.43 1.23
2 Assist FHP $854.12 0.06
3 Debris $35.00 0.56
4 Diesel $38.00 0.01
5 Directions $0.00 0.02
6 Dispatch Not Found $0.00 0.66
7 Flat Tire $35.00 2.79
8 Gas $38.00 1.07
9 Jump $35.00 0.27
10 Lock Out $35.00 0.002
11 Minor Repair $35.00 0.27
… … … …
4-18
Tool Input Form
Case Study
Case Study Results
Next Steps
The tool and methods developed in this study will be implemented in MPO approved regional demand models
Outreach activities continue to provide information about project deliverables to the planning and ITS communities Presentations has been made at the statewide,
regional, and local FSUTMS model user groups in addition to ITS working group
Further enhancements being planned