A transparent lens for motorist traffic light signals and pedestrian "Don't Walk" signs that displays, in Lcd countdown "real-time", how much time remains before the traffic signal command will change. The lens is easily shaped to be adapted over any existing traffic control device or magnified over...http://www.google.fr/patents/US6331824?utm_source=gb-gplus-shareBrevet US6331824 - Traffic control signal with displayed time-elapse
