PROXIMITY SENSING SYSTEMS AND THEIR CONTROL

Embodiments of the present invention provide a controller. The controller comprises an input means () for receiving a trajectory parameter signal comprising one or more parameters indicative of the trajectory () of a vehicle (). The controller further comprises a processing means arranged to set, in dependence on the one or more parameters, a distance from the trajectory for a boundary of an alert zone (), where the alert zone boundary is, in use, determinative of the minimum distance from the trajectory () below which a detected object will trigger an alert.