How it works
The safe-distance technology’s radar sensor has a range of up to 200 metres and a beam angle of 12 degrees. The radar sensor and control unit are combined into a single unit which is located – on the Passat, for example – behind the Volkswagen badge in the radiator grille.
Using the signals from the radar sensor, the control unit computes the distance to the vehicle ahead and your car’s speed relative to it. It also works out its lateral position on multi-lane roads. If there are several vehicles within the sensor’s field of coverage at the same time, this information is used to select which of the vehicles the system should track. The radar sensor is not capable of detecting stationary obstructions, such as the end of a tailback or crash barriers, however.
If approaching a slower vehicle ahead or if another vehicle cuts in front of you, the adaptive cruise control slows down the car by initiating corrective controls in the engine management and, if necessary, in the braking system too. If the required rate of deceleration exceeds 30% of the vehicle’s maximum stopping power, visual and audible warning signals will prompt the driver to apply the brakes manually.