Power-saving illuminated traffic sign - has sec. cell battery charged by solar cell panel by day and lights up only in response to detection of motor vehicle headlamp(s)

摘要

The traffic sign has a lamp or bulb (2) for illuminating the sign with a continual or blinking light, a re-chargeable battery (4) for supplying the electrical power needed, a solar cell arrangement (3) for charging the battery during the day, a sensor (6) for detecting a vehicle, and a control unit (7) for switching the power supply on or off. The vehicle sensor reacts to the approach of a vehicle and, when it is a certain distance away, the control unit responds by switching on the power for the light. It also reacts as the vehicle has moved a certain distance away, the control unit responding by switching the power off again. A sensor (5) detects whether it is day or night. The control unit responds by switching the power on only at night time. ADVANTAGE - Can be used where there is no power supply. By suddenly lighting up ensures that driver notices it.