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Flashers (Qtbcwf)

Definition
Flashing lights at grade crossings that warn motorists, bicyclists, and/or pedestrians of approaching trains. Also, devices used to turn highway traffic signal indications on and off at a repetitive rate of approximately once per second. (Source: AASHTO Glossary)
Broader Term
Switches (Electricity) (Qtbcw)
Related Terms (Hierarchical)
Spark gaps (Qtbcws)