Abstract: An emergency report apparatus in a vehicle transmits a signal of an emergency report to a center apparatus via a communication network when determining that the vehicle collides. The apparatus has a plurality functions for the emergency report with an operating power supplied from a vehicle battery in the vehicle. A backup battery is included to supply an operating power when the electric power supplied from the vehicle battery declines. A measurement device is included to measure a battery capability of the backup battery. A restriction device is included to restrict a function for the emergency report when the battery capability measured is lower than a predetermined value.

Abstract: An ultrasonic detector for roadway vehicles comprises an array of electroacoustic transducers mounted on the rear of the vehicle. The transducers are sequentially driven by a transmitter circuit to transmit a pulsed, laterally shifting ultrasonic energy toward an object located behind the vehicle in one of plural regions defined by partially overlapped directivity patterns of adjacent transducers. A receiver circuit is coupled to the transducer array to receive echos returning from the object during the interval between successive beam transmissions. A logic circuit detects the lateral position of and the distance to the object for giving relevant indications on a display unit, the audible tone being variable depending on object distance. An audible warning device is optional.