FIELD EVALUATIONS OF AN ADAPTIVE TRAFFIC SIGNAL CONTROL SYSTEM USING PRIVATE SECTOR PROBE DATA

摘要

This study evaluated the in-service performance of the InSync Adaptive Signal Control (ASC) system utilizing field data collected from the private sector travel time vendor INRIX. A total of six corridors in Virginia were tested with an extensive data collection period. The measurements of effectiveness (MOEs) adopted are mainline delay savings and travel time reliability measurements (95th percentile travel time, and buffer index). All the before-and-after MOEs were compared using t-tests, and the Pearson correlation of the MOEs with respect to various quantitative site specific factors was assessed to determine if effectiveness could be tied to specific site characteristics. The results indicate that the adaptive signal control system generally reduces delay by about 25% and improves travel time reliability by about 16%. The performance of ASC system are impacted by site specific factors, like AADT, signal density and access point density.