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  • S-Class
  • Saloon long version
  • 08/2021
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Function of Active Lane Change Assist

Active Lane Change Assist supports the driver when changing lanes and is activated by indicating briefly.

Active Lane Change Assist is only an aid and not a substitute for your attention. It is essential that you observe the notes on driving systems and your responsibility in the vehicle Owner's Manual; you may otherwise fail to recognise dangers.

The following conditions must be fulfilled for a lane change:

  • You are on a motorway or high-speed major road.

  • The vehicle speed is between approximately 80 km/h and 180 km/h.

  • The neighbouring lane is separated by a broken lane marking.

  • No vehicle or obstacle is detected in the adjacent lane.

  • Since the last time the vehicle was started, the sensors have detected a vehicle at a suitable distance behind your vehicle.

  • Active Lane Change Assist is selected in the multimedia system.

  • Active Distance Assist DISTRONIC and Active Steering Assist are activated on motorways.

The system is not available and must be reactivated in the following situations:

  • Active Distance Assist DISTRONIC and Active Steering Assist were already activated before entering the motorway.

  • The system briefly does not detect the road you are on as a motorway or a motorway-like road, e.g. on a motorway junction.

As soon as Active Lane Change Assist detects a suitable road, you can reactivate it with , or .

Driver display in the Assistance menu
Green arrow: lane change initiated
Red arrow: lane change cancelled

When Active Lane Change Assist is available, the display appears along with green arrows in the driver display. If the system has been activated but is not currently available, the display appears along with grey arrows in the driver display.

If no vehicle or obstacle is detected in the adjacent lane and a lane change is permitted, the lane change begins after the driver has indicated briefly. The lane change is shown to the driver with a flashing green arrow next to the steering wheel symbol. Green arrow is displayed in the appropriate adjacent lane in the Assistance menu in the driver display. The Lane change to the left message, for example, also appears.

Active Lane Change Assist can be cancelled in various situations, including the following:

  • Change in the surrounding conditions (e.g. detected obstacle).

  • The driver removes their hands from the steering wheel.

  • The driver steers with too much force or in the opposite direction.

  • The driver moves the turn signal indicator in the opposite direction.

  • Active Distance Assist DISTRONIC or Active Steering Assist is deactivated.

  • The vehicle cannot make the lane change as planned.

Cancellation of Active Lane Change Assist is displayed as follows:

  • The arrow in the selected direction of travel turns red.

  • A corresponding message appears on the driver display.

  • In certain circumstances a warning tone sounds.

WARNING Risk of accident when changing lane to an occupied adjacent lane

Lane Change Assist cannot always clearly detect if the adjacent lane is free.

The lane change might be initiated although the adjacent lane is not free.

Before changing lanes, make sure that the neighbouring lane is free and there is no danger to other road users.
Monitor the lane change.
WARNING Risk of accident if Lane Change Assist unexpectedly stops functioning

If the system limitations for Lane Change Assist have been reached, there is no guarantee that the system will remain active.

Lane Change Assist cannot then assist you by applying steering torque.

Always monitor the lane change and keep your hands on the steering wheel. Observe the traffic conditions and steer and/or brake if necessary.
System limits
The system may be impaired or may not function in the following instances:

  • There is poor visibility, e.g. due to snow, rain, fog, heavy spray, greatly varying light conditions or strong shadows on the carriageway.

  • There is glare, e.g. from oncoming traffic, direct sunlight or reflections.

  • Due to insufficient illumination of the road, or if the exterior lighting indicates a malfunction.

  • The windscreen is dirty, misted up, damaged or covered in the vicinity of the camera, e.g. by a sticker.

  • The sensors are damaged, covered or dirty.

  • No, or several, unclear lane markings are present for one lane, or the markings change quickly, for example, in a construction area or junctions.

  • The system does not detect a suitable road, for example, in tight bends or shortly after a slip road.

  • The lane markings are worn away, dark or covered up, e.g. by dirt or snow.

  • If the distance to the vehicle in front is too short and thus the lane markings cannot be detected.

  • There are obstacles on the lane or projecting out into the lane, such as object markers.

  • When the tyre pressure is too low.

Also observe the system limits of Active Steering Assist and the information on vehicle sensors and cameras in the vehicle Owner's Manual.

The Active Lane Change Assist sensors adjust automatically while a certain distance is being driven after the vehicle has been delivered. Active Lane Change Assist is unavailable or only partially available during this teach-in process, and no arrows are displayed next to the Active Steering Assist symbol.