Houston, Texas, United States
Emergency Response Management System Study
Summary Information
This report evaluated the emergency vehicle traffic signal preemption system deployed in the City of Houston between 1991 and 1992. The system was designed to activate or extend green time for emergency vehicles as they approached signalized intersections. Emitters were installed on emergency vehicles and then calibrated to activate signals within a quarter mile. The preemption system allowed cross street traffic to stop and clear each intersection normally. Traffic queues in approach lanes could then pull through and make way for emergency vehicles.