Adaptive Cruise Control (ACC) is a special form of the conventional cruise control systems which is used to maintain and control the speeds of cars and other intelligent vehicles. Adaptive cruise control is an intelligent form of cruise control systems that slows down and speeds up automatically to keep pace with the car in front of you. It dosent make use of any satellite, any roadside infrastructures or any cooperative support from other vehicles, rather it uses sensors and lasers to control the speed of vehicles. The main impact of adaptive cruise control system is on driver’s safety as by adjusting the distance between according to the traffic conditions. The overall process is achieved through a radar headway sensor, longitudinal controller and digital signal processor. Adaptive cruise control systems are being enhanced to guide through collision warning capabilities to warn drivers through audio or visual signals that a collision is imminent and that evasive steering is required. Now-a-days, Adaptive cruise control system is often paired with a pre-crash system which alerts the driver and often starts braking. Adaptive cruise control is also known as autonomous cruise control, active cruise control, intelligent cruise control or radar cruise control.