Autonomous cruise control (
ACC; also called
adaptive cruise control or
radar cruise control) is an optional
cruise control system for
road vehicles that automatically adjusts the vehicle speed to maintain a safe distance from vehicles ahead. It makes no use of satellite or roadside
infrastructures nor of any
cooperative support from other vehicles. Hence control is imposed based on sensor
information from
sensors only.
Cooperative Adaptive Cruise Control (CACC) further extends the automation of navigation by using information gathered from fixed infrastructure such as satellites and roadside beacons, or mobile infrastructure such as reflectors or transmitters on the back of other vehicles.