Finally, the exterior emergency indicator light may be powered by solar energy, by solar recharged backup battery or by regular household current. Further, a radio frequency transmitter/receiver link or a low power laser/photodetector arrangement can eliminate the need for physical wiring 18 between ...
(as best seen in FIG. 1a) mounted to a frame 16 that traverses the vehicle 11. The frame 16 supports a housing 15 containing a portion of the electronics for controlling the signalling devices as will be explained more fully hereinafter. The light bar 13 is mounted to the vehicle 11 by...