Abstract
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 extensive data collected over 6 months. 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 is affected by site-specific factors, like annual average daily traffic, signal density, and access point density.
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Published In
Journal of Transportation Engineering
Volume 142 • Issue 1 • January 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jan 5, 2015
Accepted: Jul 16, 2015
Published online: Sep 10, 2015
Published in print: Jan 1, 2016
Discussion open until: Feb 10, 2016
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