| 摘要 |
A parking space monitor unit (3) is provided comprising detecting means adapted to detect the presence of a vehicle (7) at a parking space (1), alarm means adapted to produce an alarm, authorisation means adapted to determine whether an approved signal has been received indicative of an allowable user or vehicle (7), and control means adapted to control the operation of the alarm means in response to the output of the authorisation means. This permits uninhibited parking of authorised vehicles, but emits an alarm should an unauthorised vehicle be parked. The monitor may further guard authorised vehicles in the parking place, in other locations as necessary, for example outside a house. In a preferred embodiment, the monitor (3) comprises a self-contained, battery-operated unit, which is simply mounted on the ground in the vicinity of the vehicle when parked. |
