US Patent 7830243 Dual mode vehicle blind spot system

A proximity sensor system for a vehicle in reverse includes a zone detection module. The zone detection module switches a first remote sensor from a first mode corresponding to a near zone rearward of the vehicle to a second mode corresponding to a far zone rearward of the vehicle. The near zone includes an area of coverage wider and shorter in range than an area of coverage of the far zone. A response module responds to first objects in the near zone and selectively responds to second objects in the far zone when the second objects are in motion.