Adaptive Cruise Control detects vehicles ahead within the system limits with the aid of a radar sensor and keeps the vehicle's speed or distance from the vehicle ahead as constant as possible within the control range. The speed range in which the system is available is between 0 and 210 km/h. The control range is from 30 to 210 km/h. In stop-and-go traffic, vehicles can brake and come to a standstill and, under certain conditions, automatically start up again. In the case of manual transmission, the gear changing process must be taken over by the driver. Operation is via a separate steering drop arm. The distance can be set at five levels; the dynamics of the system can be adjusted via Audi drive select or the ACC menu. Includes Audi pre sense front.