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Gresham Traffic Signal System Optimization

Gresham Traffic Signal System Optimization. A Comprehensive Evaluation of Corridor Performance After Deploying Adaptive Signal Control. Presentation Outline. Corridor background Project goals Key issues – How is adaptive performing? Evaluation results - Was it worth it?.

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Gresham Traffic Signal System Optimization

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  1. Gresham Traffic Signal System Optimization A Comprehensive Evaluation of Corridor Performance After Deploying Adaptive Signal Control

  2. Presentation Outline • Corridor background • Project goals • Key issues – How is adaptive performing? • Evaluation results - Was it worth it?

  3. Signalized Intersection City of Gresham, Oregon Gresham is a Community East of Portland, OR 25,000 ADT 35,000 ADT 40,000 ADT

  4. Goals and Objectives of the Project Were Reasonable • Goal: Improve performance of the existing transportation system during peak and off-peak periods • Reduce travel time by 10% • Reduce corridor delay by 5% • Decrease stops by 5% • Implement a user friendly, reliable system • Utilize existing equipment

  5. How is the System Performing?Considering Our Key Issues

  6. Adaptive Systems Require Too Much Detection?

  7. How Will We Know What the System is Doing if it Constantly Changes? • With all the information available in SCATS, how can you not know?

  8. Volumes are Consistent. Do we Need to Adapt? Plan 1 – 110 sec Plan 2 – 110 sec Plan 4 – 134 sec Plan 3 – 126 sec 140 130 120 TOD Cycle Length Burnside Road/Hogan Drive Tuesday, December 25, 2007 (Christmas Day) Adaptive Cycle Length Plan 1 – 110 sec Plan 2 – 110 sec Plan 3 – 126 sec Plan 4 – 134 sec Burnside Road/Hogan Drive Tuesday, December 18, 2007 (Typical Tuesday) Time (Hours)

  9. Volumes are Consistent. Do we Need to Adapt? Plan 4 – 134 sec Plan 1 – 110 sec Plan 2 – 110 sec Plan 3 – 126 sec 140 130 TOD Cycle Length Adaptive Cycle Length Burnside Road/Hogan Drive Thursday, November 22, 2007 (Thanksgiving) Plan 1 – 110 sec Plan 2 – 110 sec Plan 3 – 126 sec Plan 4 – 134 sec Burnside Road/Hogan Drive Thursday, November 15, 2007 (Typical Thursday) Time (Hours)

  10. The System Did Not Require Additional Staff • Agencies in California did not add staff after installation of SCATS • Gresham did not add staff after installation of SCATS • The system provides more functionality and tools for engineers and technicians to do their jobs

  11. System Performance:Was it Worth it?

  12. PM Peak Travel Time ComparisonEastbound Burnside -16%

  13. PM Peak Travel Time ComparisonWestbound Burnside -16%

  14. PM Peak Travel Time ComparisonEastbound Burnside Legend 1997 Free 1998 TOD 2004 Free 2004 (1998 TOD) 2004 TOD 2007 (2004 TOD) 2007 SCATS 500 424 405 393 373 400 368 349 Travel Time (sec) 314 300 200 100 0

  15. Side Street Delay Results Were Mixed

  16. Side Street Delay Results Were Mixed

  17. Side Street Delay Results Were Mixed

  18. Gresham Adaptive Signal SystemProject Benefits • Travel times reduced by up to 25 percent • Average travel time reduced by over 60 seconds per vehicle in the PM peak. • 100,000 vehicle-hours of delay saved per year • 75,000 gallons of fuel saved per year • Benefit/cost ratio • First Year = 1.7 • Five Year = 4.9 Signalized Intersection

  19. Plans for New Adaptive Systems in Oregon

  20. Thank You! Jim Peters, P.E., P.T.O.E Transportation Engineer DKS Associates Portland, OR 97201 503.243.3500

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