Expansion of Adaptive Traffic Signal System (TF389)
Location
East H St from Hidden Vista Dr to Tierra del Rey, Telegraph Canyon Rd from Canyon Plaza Dwy to Auburn Av, Otay Lakes Rd from Bonita Vista Middle Dwy to Telegraph Canyon Rd
City or County Responsible for Project
City of Chula Vista, California
Category
Safety or Intelligent Transportation System Projects
Author
Eddie Flores
City of Chula Vista
276 Fourth Avenue
6194765368
Project Description
This project replaced an existing Adaptive Traffic Control System (ATCS) that included 12 intersections surrounding Southwestern Community College, Bonita Vista High School, and two retail centers. In addition, it expanded the ATCS to a total of 29 intersections, linking the community college, high school, and retail centers to Interstate 805 via the major arterial roadways of East H Street and Telegraph Canyon Road. The objectives of the project were twofold: to improve safety along the major arterial corridors by better synchronizing traffic signals and to improve environmental quality by reducing vehicle emissions. Guided by local and regional objectives, the City recognized the potential effectiveness of improving signal operations to reduce intersection crashes. A systematic approach was used under the City’s Traffic Monitoring Program (TMP) to identify the project intersections. The City routinely reviews system performance of its arterial networks through an evaluation of signal timing operations and safety. East H St, Telegraph Canyon Rd, and Otay Lakes Rd were key arterial roadways under the TMP priority list. Upon review of the collision history reports for each corridor, an analysis showed that the primary collision types were right-angle, rear-end, and left-turn collisions, which are correctable by improved signal coordination and optimized change intervals. The benefits from improved coordination through the expansion of the City’s adaptive signal control system would reduce the number and frequency of stops and help maintain more constant speeds. As a result of its thorough safety analysis and strong benefit-cost ratio, the City was awarded an FHWA Highway Safety Improvement Program (HSIP) grant for the project. The project implemented the Trafficware SynchroGreen ATCS across the three corridors with closed circuit television cameras at key intersections. As the City monitors system performance from both a traffic flow and safety perspective, since activation in February 2019, the improved signal operations resulted in nearly 20% reduction in the number of stops and over 28% reduction in delay time while stopped, resulting in smoother flow of traffic through the corridors. This is equivalent to reduction of approximately 28,000 tons of carbon dioxide per year over the entire project.
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