Highway-Rail Crossing Handbook
preemption-of-traffic-signals — Preemption of Traffic Signals
Crossing Handbook · Chapter 2 — Engineered Treatments. Full current text with cross-references on BuildSpec.
76PREEMPTION OF TRAFFIC SIGNALS Because a downstream traffic signal may cause traffic to back up toward and/or through a grade crossing, it is essential that provisions be made to allow traffic to clear from the track area prior to train arrival. This is accomplished by means of traffic signal “preemption”—the normal sequence of operation is suspended and a programmed alternative sequence takes over. A preemption sequence compatible with railroad crossing active traffic control devices is extremely important to provide safe vehicular and pedestrian movements. Such preemption serves to ensure…
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