New York State Department of Transportation Traffic Signal Timing and Arterial Optimization – Suffolk County

A primary objective of this project was to create optimum traffic flow patterns, thereby reducing vehicle delay, vehicle stops, fuel consumption, and vehicle emissions. This was achieved with the development of innovative timing plans through the use of the Synchro traffic signal optimization program. Other computer programs, such as SIMTraffic (Synchro’s companion modeling program), may prove to be beneficial and augment the Synchro program, as needed, to optimize traffic signal timing.

Project deliverables included 100 turning movement volume counts, ATR count data, time-space diagrams, traffic signal coordinated timing plans, project design and summary reports with MOE’s and Synchro data files for the project intersections. All information was in NYSDOT format and were provided in paper and electronic copy.

GPI met these objectives by way of our local knowledge of the State’s roadway network, past experience on similar projects, and extensive understanding of timing plan development. This project was completed on time and within budget. The GPI team collected data and assembled current intersection plans and timing data from the State, developed an inventory of traffic signal equipment and capabilities, and collected additional traffic volume data. A traffic analysis was conducted of existing conditions to develop a current database for signal timing simulation and optimization signal timing plans and time space diagrams utilizing Synchro, and/ or SIMTraffic, Transyt-7F, signal optimization programs. A signal system report documented the traffic analysis and optimizations for NYSDOT review and comment.

The team investigated, studied, analyzed, and documented traffic signal timing requests, investigated alternatives and recommended actions. Under NYSDOT supervision, proposed timings in traffic signal controllers and fine-tuned timing plans were implemented in the field to further reflect ambient traffic conditions and measure improvements resulting from the optimized timing. Electronic records documented optimized arterial coordination and traffic signal timing using NYSDOT and Synchro formats for all roadway segments.