Abstract: An ultrasonic distance detector for vehicles using a plurality of transducers located around the sides of the vehicle and connected to transmitters for sending sonic pulses to distant objects. Each of the transducers is connected to a receiver for detecting sonic echoes from too close objects. The output of each receiver is connected to individual indicator lamps and a warning device so that if any of the lamps are energized, the driver is warned that a part of the vehicle is in danger of a collision. The front and rear transducers are separated from the side transducers so that there can be an independent measurement dependent upon the speed of the vehicle.