Active cruise control is a cruise control / speed limiter system with an extended cruise control function in relation to the distance of the vehicle in ahead.
This function is particularly suited to motorway driving in semi-dense or fluid traffic conditions which avoids systematic disconnection of the cruise control each time a vehicle is present ahead. When the radar detects a vehicle, a constant gap is maintained by automatically reducing the speed of the vehicle by up to 20 km/h thanks to the engine brake's action on the accelerator. When the lane becomes free, cruise control returns to the initially requested speed. If a deceleration of 20 km/h is not sufficient to maintain the gap, cruise control alerts the driver and restores control of the speed to the driver.