Operation principle of lane departure warning
Lane departure warning uses a video camera to detect lane markings ahead of the vehicle and to monitor the vehicle's position in its lane. When the function detects that the vehicle is about to unintentionally move out of the lane, it warns the driver by means of a visual, audible and/or haptic signal, such as steering wheel vibration. These warnings signal the driver that the vehicle is drifting off course, allowing him/her to countersteer accordingly. The function does not issue a warning when the driver activates the turn signal to change lanes or turn intentionally.
The camera‘s lane detection algorithm records and classifies all common lane markings up to a distance of approximately 60 meters ahead (or up to 100 meters in excellent visibility conditions), whether the road markings are continuous, dashed, white, yellow, red or blue. The camera can even detect Botts’ dots (raised highway markers).