Environmentally oriented traffic lights indicating duration of red phase

摘要

The traffic lights have an indicator of the duration of the red phase. The indicator arrangement, which can be mounted on the traffic lights, can give a mechanical analogue signal , e.g. the position of a pointer or indicator point on a scale. Alternatively, the indicator can give a digital signal. A stationary transmitter can send an electromagnetic signal to receivers in vehicles with displays. A controller in a vehicle can be used to switch off the engine of a vehicle at a red light.