Traffic signal preemption

found: Work cat.: Abro, A.M. Impact of signal preemption on transit performance, 2007:leaf 1 (Signal preemption for transit ... is used to shorten transit travel times by adjusting signal timing plans to benefit transit movements or by having signal phases switch when a transit vehicle approaches)

found: Wikipedia, Nov. 9, 2007(Traffic signal preemption is a type of system that allows the normal operation of traffic lights to be preempted, often to assist emergency vehicles. The most common use of these systems is to allow emergency vehicles priority by changing traffic signals in the path of the vehicle to green (or in some cases, flashing green ) and stopping conflicting traffic. Sometimes, signal preemption is also used at railroad grade crossings to prevent collisions, and by light-rail and bus rapid transit systems to allow public transportation priority access through intersections to ensure they are able to remain on schedule and improving commute times)

found: ODOT traffic manual, via WWW, Nov. 9, 2007(Traffic signal preemption systems are traffic control devices that interrupt the normal operation of traffic signals to give priority or preference to special vehicles (trains, emergency vehicles, buses, etc.))

found: Transportation research thesaurus (TRT), via WWW, Nov. 9, 2007(Traffic signal preemption -- Use for: Preemption (Traffic signals), Traffic signal priority systems)

notfound: McGraw-Hill dictionary of scientific and technical terms, 2003;Academic Press dictionary of science and technology, 1992;Chambers dictionary of science and technology, 1999