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  • EQS
  • Saloon
  • 04/2021
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Function of route-based speed adaptation

When Active Distance Assist DISTRONIC is activated, the vehicle speed will be adapted accordingly to the route events ahead. Depending on the drive program selected, the vehicle negotiates a route event ahead in an energy-saving, comfortable or dynamic manner. When the route event has been passed, the vehicle accelerates again to the stored speed. The set distance to the vehicle in front, vehicles detected ahead and speed restrictions ahead are taken into account.

Route-based speed adaptation can be activated in the multimedia system More.

The following route events are taken into account:

  • Bends

  • Roundabouts

  • T-junctions

  • Turns and exits

  • Traffic jams ahead (only with Live Traffic More)

Also, the speed is reduced if the turn signal indicator is switched on and one of the following situations is detected:

  • Turning off at junctions

  • Driving on slowing-down lanes

  • Driving on lanes adjacent to slowing-down lanes

The driver is responsible for choosing the right speed and observing other road users. This applies in particular to junctions, roundabouts and traffic lights, as route-based speed adaptation does not brake the vehicle to a standstill.

If a corresponding route event is detected while route guidance is active, the first speed adjustment is carried out automatically. If the turn signal indicator is switched on, the selected route is confirmed and further speed adjustment is activated.

Speed adaptation is cancelled in the following cases:

  • If the turn signal indicator is switched off before the route event and it is therefore assumed that the route event is not relevant to the driver.

  • If the driver depresses the accelerator or brake pedal during the process.

System limits

Route-based speed adaptation does not take right of way regulations into account. The driver is responsible for complying with road traffic regulations and driving at a suitable speed.

In difficult conditions, the speed selection made by the system may not always be suitable. This applies to the following situations, for example:

  • unclear roads

  • road narrowing

  • varying maximum permissible speeds in individual lanes, for example at toll stations

  • wet road surfaces, snow or ice

  • if transport equipment, for example a trailer or bicycle rack, is attached to the trailer hitch and the electrical connection has been correctly established

In these situations the driver must intervene accordingly.

WARNING Risk of accident in spite of route-based speed adaptation

Route-based speed adaptation can malfunction or be temporarily unavailable in the following situations:

  • If the driver does not follow the calculated route

  • If map data is not up-to-date or available

  • In the event of roadworks

  • In bad weather or road conditions

  • If the accelerator pedal is depressed

  • In the event of electronically displayed speed limitations

Adapt the speed to the traffic situation.