Improve emergency crew response time by giving advanced warning to drivers that emergency vehicles are departing the fire station. The Emergency Vehicle Warning System consists of two 12″ LED flashing yellow beacons and a diamond-shaped flashing or unlighted traffic sign. The system can be activated by the optical emitters used by most fire department emergency vehicles to control traffic signals en route to an accident. Additional activation methods include a wireless keyfob transmitter, push-button transmitter, or in-station transmitter.
More info:
TS50 Emergency Vehicle Warning Systems