The active cruise control allows you to set the cruising speed of your vehicle. 

It also automatically corrects itself when the safe distance between two vehicles isn’t respected. The system uses a radar sensor fitted on the frotn bumper and a video camera placed at the top of the windshield to detect the presence of a vehicle in front at a short distance. Active cruise control oly operates if:

The vehicle speed is between 19 and 110 mph

The vehicle in front is fully within the lane

There is sufficient braking distance from the car in front.