| 摘要 |
<p>There is disclosed a method of detecting the presence of a vehicle travelling along a path comprising the steps of; positioning a predetermined number of sensor elements long a predetermined portion of the path at predetermined intervals, each sensor element being configured to take a reading of a magnetic field present in their immediate proximity and to transmit a signal in accordance with said reading; receiving one or more transmitted signals from one or more of the predetermined number of sensor elements; processing the received transmitted signals to identify an active sensor element that transmitted the signal from the predetermined number of sensor elements; comparing the number of active sensor elements against a number of live sensor elements to determine whether a vehicle is travelling along the path; and activating a warning system upon determining that a vehicle is travelling along the path.</p> |
