Patent ID: 6867692

Claim:
A display device comprising: a first actuation means that corresponds to the state of brake lights on an automobile, said first actuation means having an input for receiving electrical energy and an output for outputting a signal indicative of the state of the brake lights; a second actuation means having an input for receiving electrical energy and an output for outputting a signal indicative of an emergency condition; logic circuitry having two inputs for receiving outputs from both the first and second actuation means and providing an output; a first illumination means coupled to the output of said first actuation means; and, a second illumination means coupled to the output of the logic circuitry wherein said second illumination means being off when both the first and second actuation means are in a non-conducting state, said second illumination means being off when both the first and second actuation means are in conducting states and said second illumination means being on when only one of the first and second actuation means is on.