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

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Presentation transcript:

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?

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

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

How is the System Performing? Considering Our Key Issues

Adaptive Systems Require Too Much Detection?

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?

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

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

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

System Performance: Was it Worth it?

PM Peak Travel Time Comparison Eastbound Burnside Average Travel Time (sec) ExistingAdaptive % Delay (Veh-Hrs) Eastbound PM Peak Volume = 1400 Existing84 Adaptive57 Change-27

PM Peak Travel Time Comparison Westbound Burnside Average Travel Time (sec) ExistingAdaptive % Delay (Veh-Hrs) Westbound PM Peak Volume = 1200 Existing75 Adaptive44 Change-31

PM Peak Travel Time Comparison Eastbound Burnside Travel Time (sec) 1997 Free 1998 TOD 2004 Free 2004 (1998 TOD) 2004 TOD 2007 (2004 TOD) 2007 SCATS Legend

Side Street Delay Results Were Mixed Delay (Veh-Hrs) Northbound/Southbound PM Peak Volume = 1300 Existing35 Adaptive34 Change

Side Street Delay Results Were Mixed Delay (Veh-Hrs) Northbound/Southbound PM Peak Volume = 600 Existing20 Adaptive18 Change-2

Side Street Delay Results Were Mixed Delay (Veh-Hrs) Northbound/Southbound PM Peak Volume = 425 Existing11 Adaptive21 Change+10

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 Gresham Adaptive Signal System Project Benefits Signalized Intersection

Plans for New Adaptive Systems in Oregon

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