| 摘要 |
<p>System and method for determining the visibility level in an outdoor environment, and/or the traffic flow , traffic density in a motorway environment. A laser transmitter transmits laser pulses toward a retroreflective element located at a fixed site at the side of a road in the motorway environment, and toward retroreflectors on the rear of vehicles traveling along the road. A processor determines the level of visibility in the environment, based on the number of laser pulses reflected from the retroreflective element and received by a visibility level detection receiver, required to reach an energy threshold, respective of the number of reflected pulses required to reach the threshold during predetermined visibility conditions. The processor also determines the traffic flow along the road and the traffic density in a road section, based on the number and timing of laser pulses reflected from the retroreflectors and received by a vehicle counting receiver.</p> |
