There are two versions of Lane assistance:
- Lane Departure Warning (LDW) - warns the driver with an acoustic signal or vibrations in the steering wheel.
- Lane Keeping Aid (LKA) - steers the car back into its lane and/or warns the driver by an acoustic signal or steering wheel pulsations.
Lane Keeping Aid is active within the speed range 65–200 km/h (40–125 mph) on roads with clearly visible side lines.
On narrow roads the function may be unavailable, in which case it goes into standby mode. The function becomes available again when the road is wide enough.
A camera reads the side lines of the road/lane.
Lane assistance steers the car back into its lane (LKA only).
Lane assistance warns with steering wheel vibrations
The steering wheel vibration varies - the longer the car stays outside the lane lines, the longer the vibration.
How Lane assistance reacts is dependent on the version and the settings:
- Steering assistance activated (LKA only): When the car is approaching a lane line, LKA will actively steer the car back into its lane by applying a slight torque to the steering wheel.
- Warning activated (LDW or LKA): If the car is about to cross a lane line the driver is warned by means of an acoustic signal or vibrations in the steering wheel.
When a direction indicator is switched on, there are no steering corrections or alerts from Lane assistance.
Lane assistance is merely a driver aid and does not engage in all driving situations or traffic, weather or road conditions.
The driver always bears ultimate responsibility for ensuring that the vehicle is driven safely and that applicable laws and road traffic regulations are followed.
A precondition for the functioning of the LKA steering assistance is that the driver’s hands are holding the steering wheel. The system monitors this continuously.
If this is not the case, a symbol and the Lane AssistanceApply steering message will be shown on the driver display, prompting the driver to actively steer the car.
If the driver does not respond to the message to steer the car, an acoustic warning signal sounds and LKA is set in standby mode. The function will then be unavailable until the driver begins steering the car again.
Lane assistance does not intervene
Lane assistance does not engage on sharp inside curves.
In certain cases, Lane assistance will allow the car to cross lane lines without activating the steering assistance or giving a warning. This occurs when for example the direction indicators are used or when the driver "straightens out" a sharp bend.
In certain demanding conditions Lane assistance may have difficulty helping the driver correctly. In such cases it is recommended to switch off this function.
Examples of such conditions are:
- road works
- poor road surface
- sharp edges or lines other than the lane lines
- a very “sporty” driving style
- winter road conditions
- poor weather with reduced visibility.
The function uses the car's camera unit, which has some general limitations, see the "Limitations for camera unit" section.