Three-Color Stop Light Signals Driver’s Action (Jun, 1950)

Three-Color Stop Light Signals Driver’s Action
Motorists following a car equipped with a three-color stop light know exactly what the driver ahead is doing. When the car is moving forward normally, the green light is on. As the driver applies the brakes, an amber light operates, warning the following driver that the car is slowing down. When the car slows down below 10 miles an hour, these two lights go off and a bright-red light appears. As soon as the car accelerates again, the green light goes back on. The lights work automatically and are housed in a box that looks like a standard traffic light. Only two wires are required for installation.