Lane departure warning

The prerequisites for a lane departure warning are an identified lane and a specific driving speed. These make the system fundamentally ready to give a warning. When crossing over a lane is imminent, the system warns the driver through a vibrating steering wheel. The system firstly uses one or two identified lanes to calculate the vehicle position relative to these lanes. The time remaining to cross over a lane is calculated with the aid of the steering angle and the driving speed. A warning is output in good time before crossing over the marking.

A warning is only output once when approaching a road marking. The warning lasts for a maximum of 2.5 seconds. No further warning is output if the vehicle remains on the lane marking. A replaced warning is only possible after steering back into the lane or a lane change. A lane change intended by the driver: no warning is output when the turn indicator is operated as an input signal.

The warning is ended in the following conditions:

• Driver steers back into the lane
• Lane change is carried out
• Vehicle is on the line for longer than 2.5 seconds
• Turn indicator for lane change is operated
• Brake is operated firmly (depending on brake pressure).

The minimum speed for a warning is country-dependent.

• Europe: 70 km/h
• United States: 40 mph
• Japan: 50 km/h

The displays for system and warning readiness are shown on the instrument cluster as well as the Head-Up Display.