The Drive Assist Plus feature (only available with Steptronic transmission) includes not only Approach Warning and Lane Departure Warning, but also Active Cruise Control with Stop&Go function. On motorways in both stop-start and stable traffic flows it takes much of the hassle out of driving. Note that it’s only available in conjunction with the Business or Professional Navigation System.
Approach Warning responds in stages. Depending on whether a vehicle ahead brakes suddenly or a stationary object is detected, the reaction ranges from a visual signal, to active braking, even bringing the vehicle to a complete standstill, if necessary.
The camera-based cruise control with Stop&Go function can be activated between 20 and 85 mph in order to maintain the set speed and the distance to the vehicle ahead – if necessary, braking the vehicle to a stop. If it has a clear line of sight, the vehicle recognises vehicles cutting into the lane and other possible disturbances, and smoothly adjusts the speed. If the tempo picks up after a brief stop, the cruise control automatically takes care of the acceleration, while after longer stops, the vehicle waits for the driver's command.
For speeds outside of the cruise control range, or if weather conditions are impacting the camera too negatively, the cruise control can still be used without regulating the distance to the car ahead.