The concept

This system issues a warning at speeds above approx. 40 mph/65 km/h if the vehicle is about to leave the lane on roads with lane markings.

The steering wheel begins vibrating lightly.

The system does not issue a warning if the turn signal is set before leaving the lane.

    See also:

    Telephone
    ...

    Deactivating HDC
    Press the button again and the LED goes out. HDC is automatically deactivated above approx. 37 mph/60 km/h. ...

    Maintenance
    The battery is maintenance-free, i.e., the electrolyte will last for the life of the battery. Your service center will be glad to advise you on questions regarding the battery. ...