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  • E-Class
  • Estate
  • 02/2019
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Function of Active Lane Change Assist

The following function is country-dependent and only available in conjunction with the Driving Assistance Package.

Active Lane Change Assist supports the driver when changing lanes by applying steering torque if the driver operates a turn signal indicator.

Assistance when changing lanes is provided if all the following conditions are met:

  • You are driving on a motorway or road with multiple lanes in the direction of travel.

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

  • No vehicle is detected in the adjacent lane.

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

  • Active Lane Change Assist is switched on in the multimedia system.

  • Active Steering Assist is switched on and active.

If no vehicle is detected in the adjacent lane and a lane change is permitted, the lane change begins after the driver has activated the turn signal indicator. This is shown to the driver with a green arrow next to the steering wheel symbol. The Lane change to the left message also appears, for example. If Active Lane Change Assist has been activated with the turn signal indicator but a lane change is not immediately possible, a grey arrow appears next to the steering wheel symbol, which remains green.

When the lane change assistance starts, the turn signal indicator is automatically activated along with the display in the multifunction display.

If a lane change is not possible, the arrow fades out after a few seconds and a new lane change must be initiated. An immediate lane change is only possible on motorway sections without speed limits.

If the system is impaired, Active Lane Change Assist may be cancelled. If it is cancelled, the Lane change cancelled message appears in the multifunction display and a warning tone sounds.

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

Lane Change Assist cannot always detect clearly 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 torques.

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 limitations of Active Steering Assist apply to Active Lane Change Assist More.

The system may also be impaired or may not function in the following situations:

  • The sensors in the rear bumper are dirty, damaged or covered, for instance by a sticker or ice and snow.

  • The exterior lighting is malfunctioning.