Mercedes-Benz GLC : Driving and driving safety systems / 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 economical, 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.

You can activate and deactivate route-based speed adaptation in the multimedia system.

The following route events are taken into account:

• Curves
• T-intersections, roundabouts and toll plazas
• Turns and exits
• Traffic jams ahead (only with Live Traffic Information )

When the toll station is reached, Active Distance Assist DISTRONIC adopts the speed as the stored speed.

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

• Turning off at intersections
• 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 intersections, roundabouts and traffic lights, as route-based speed adaptation does not brake the vehicle to a standstill.

When 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 canceled in the following cases:

• If the turn signal indicator is switched off before the route event.
• 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.

The speed adaptation made by the system may not always be suitable, particularly in the following situations:

• The road's course not clearly visible
• Road narrowing
• Varying maximum permissible speeds in individual lanes, for example at toll plazas
• Wet road surfaces, snow or ice
• When towing a trailer

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.

Setting route-based speed adaptation

Requirements:

• Active Distance Assist DISTRONIC is activated.
• ECO Assist is active.

Multimedia system:

Settings Assistance Route-based Speed

Activate or deactivate the function. When the function is active, the vehicle speed is adjusted depending on the route events ahead.

Further information on the route-based speed adaptation.