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Field-Based Evaluation of Corridor Performance After Deployment of an Adaptive Signal Control System in Gresham, Oregon

The majority of traffic signal control systems in the United States use, as their basis for coordination, static timing plans (also called timing patterns) that have been generated on the basis of typical average traffic volumes. In 2005, the City of Gresham, Oregon selected and deployed the Sydney Coordinated Adaptive Traffic System (SCATS) on Burnside Road, a major 5-lane arterial carrying 38,000 vehicles per day, between Eastman Parkway and Powell Valley Road. A field evaluation was conducted to compare optimized time-of-day coordination and the SCATS system on the basis of changes in travel time, delay, and stops along this road segment. Probe vehicle data were collected on three routes during peak and non-peak hours in two travel directions. Side street delay was also studied for three intersections in the corridor. Overall, it can be concluded that the implementation of the SCATS adaptive signal control system has improved the Burnside corridor in terms of travel time, stopped delay and number of stops. Travel times on the primary analysis route decreased 2 to 15 percent for weekdays and weekends with the exception of the morning weekday westbound direction which increased 10 percent (likely because the time-of-day plan had heavily favored this direction). Although the secondary evaluation routes did not see as consistent improvements, the majority of changes were still positive. Analysis of side street delay was less conclusive, although the majority of time periods and directions did see improvement.