| 摘要 |
At night time vehicles have their headlights and rear lights switched on. Similarly, vehicle lights are generally switched on in periods of poor daytime visibility. The present invention uses the light emitted by vehicles to provide enhanced functionality to road studs. For example, there is described a road stud for disposal in the road surface. The road stud comprises a light sensor, a microprocessor and a light source. The light sensor is operable to sense incoming light from a vehicle on the road surface and to output associated sense light data. The microprocessor is operable to analyse the sensed light data, thereby enabling the detection of vehicles with their lights on. The light source is arranged to emit light from the road stud. The microprocessor is operable to reduce the power drawn by the light source when no vehicles with their lights on have been detected for a predetermined period of time. |
