5. REPORT DATE 6. PERFORMING ORGANIZATION CODE

The report describes the methodology and findings of the evaluation of adaptive signal control in a real life corridor. The study section was a five mile segment of the Pacific Coast Highway in Los Angeles with nine signalized intersections operating under adaptive control using the Los Angeles Department of Transportation (LADOT) Adaptive Traffic Control System (ATCS). Optimal fixed time time-of-day (TOD) plans were developed and implemented at the test site. The performance of the ATCS and the fixed TOD plans was evaluated using extensive field data on travel times and queue lengths collected through probe vehicles, Bluetooth sensors and video cameras. The findings indicate that ATCS performed better than the fixed-time plans during the time of peak direction in the arterial through traffic. All strategies had similar performance in the midday time period. A number of limitations was identified for ATCS under oversaturated conditions, including under allocating green time to the critical approach at the bottleneck intersection, allocating more green time than necessary at intersections upstream of the bottleneck, and inappropriate setting of offsets at intersections downstream of the bottleneck resulting in additional delays for traffi