Signal Technician's Installation and Maintenance Manual for Advance Warning of End-of-Green Phase at High Speed Traffic Signals

This report describes the research conducted within a two-year study that developed an effective advance warning for end-of-green phase at high-speed traffic signals in Texas. High-speed signals are defined as having approach speeds of 45 mph or more. The Advance Warning of End-of-Green System (AWEGS) was developed in this research by the Texas Transportation Institute for the Texas Department of Transportation (TxDOT). AWEGS was deployed at two locations, one on a two-lane highway in Waco, Texas, and another on a four-lane highway in Brenham, Texas. Deployments at these two locations showed a reduction in average red-light running per day of approximately 40-45 percent. This report describes the installation and maintenance procedures for operating AWEGS. The details of ensuring proper installation of loops and W3-4 signs are illustrated. The connectivity of the input/output (I/O) devices and the flasher panel functionality are described. Finally some guidance is given on the programming necessary in both the traffic signal controller as well as the AWEGS controller to operate AWEGS. The report also describes the maintenance procedures necessary for AWEGS to perform efficiently. AWEGS will only work properly if these maintenance procedures are followed.