| 摘要 |
<p>A vehicle surveillance system has a plurality of side-light units (20) mounted on opposite sides of a truck, bus, train or a similar long vehicle (10). The side-light units form an RF communication network on the vehicle (10). Each side-light unit (20) comprises a day-running light source (24), a sensor (26) for defining a surveillance zone (50) on the side of said vehicle (10), said the sensor (26) being arranged to detect an object or a movement of an object within the surveillance zone, and an RF transmitting means (28) which is controlled by said sensor (26) and arranged to transmit an RF detection signal (RFD) from said side-light unit (20). Existing day-running side-light units of a vehicle may be replaced with the inventive vehicle day-running side-light units.</p> |
