Abstract
This paper describes newly developed the Active Rear Steer (ARS) system. The ARS system is distinct item from the conventional Four Wheel Steering (4WS) system in that the ARS system focuses on "Active Safety". The ARS system is made up of sensors, an electric control unit (ECU) and a rear steering actuator, which has the high performance to realize the Active Safety. The effect of the ARS system is certified by the vehicle performance tests and the examination of the burden to a driver on the vehicles equipped with and without the ARS system. The test results confirm that the ARS system is effective as a safety device of the vehicles.