Overheight detector system for drive through restaurant

Claim 1

A vehicular overheight detection and warning system for a building having a roof or canopy overhang with a fixed clearance above a driveway surface along which a vehicle is required to drive to obtain services from an attendant at a service location available to the driver of the vehicle and within the building is protected by the overhang, comprising: (a) a detector mounted at a detection location required to be passed by the vehicle before reaching the service location and at an elevated level selected so as to be able to detect any vehicle of a height in excess of said clearance and to actuate an associated switch in response thereto; (b) first signalling means dependent on actuation of said switch and operative to produce a first selected signal perceptible by the driver of the vehicle at a location prior to reaching the said service location to warn the driver of an overheight condition when so detected; (c) second signalling means dependent on actuation of said switch and operative to produce a second selected signal at said service location perceptible to said attendant to simultaneously warn said attendant of said overheight vehicle; and (d) means for delaying the actuation of said switch to discriminate between overheight vehicles and overheight vehicle antennas.