| 摘要 |
<p>The device (1) has a sensor (5) operated according to a light-section procedure to emit light (9) from a location along a roadway to project a line of light (10) onto the roadway and a vehicle located on the roadway. The sensor records line of light from next location along the same side of the roadway, and detects wheel axle during exhibition of recorded line of light. The shift-free change of light is realized in the direction different from original direction when the roadway is empty during emanation of light from the side of roadway.</p> |
