Mercedes-Benz GLC : Driving and driving safety systems / Function of Active Speed Limit Assist

If speed limit change between 12 mph (20 km/h) and 80 mph (130 km/h) is detected and the automatic adoption of speed limits is active, it will be automatically adopted as the stored speed.

The driven speed is adjusted when the vehicle is level with the traffic sign at the latest. In the case of signs indicating entry into an urban area, the speed is adapted according to the speed permitted within the urban area. The speed limit display in the Instrument Display is always updated when the vehicle is level with the traffic sign.

If there is no speed restriction on an unlimited stretch of road (e.g. on a freeway), the recommended speed is automatically adopted as the stored speed. The system uses the speed stored on an unlimited stretch of road as the recommended speed. If you do not alter the stored speed on an unlimited stretch of road, the recommended speed is 80 mph (130 km/h).

If Active Distance Assist DISTRONIC has been put into passive mode by pressing the accelerator pedal, only speed limits which are higher than the set speed are adopted.

Observe the notes on driving systems and your responsibility; you may otherwise fail to recognize dangers.

System limits

The system limits of Traffic Sign Assist apply to the detection of traffic signs.

Speed limits below 12 mph (20 km/h) are not automatically adopted by the system as the stored speed. Temporary speed restrictions (e.g. for a certain time or due to weather conditions) cannot be properly detected by the system. The maximum permissible speed applying to a vehicle with a trailer is not detected by the system.

Adjust the speed in these situations.

WARNING Risk of accident due to Active Speed Limit Assist adapting the vehicle's speed

The speed adopted by Active Speed Limit Assist may be too high or incorrect in some individual cases, such as:

  • at speed limits below 12 mph (20 km/h)
  • in wet conditions or in fog
  • when towing a trailer

Mercedes-Benz GLC. Function of Active Speed Limit Assist Ensure that the driven speed complies with traffic regulations.

Mercedes-Benz GLC. Function of Active Speed Limit Assist Adjust the driving speed to suit current traffic and weather conditions.

    Increasing or decreasing the speed

    mph (1 km/h): press rocker switch up or down to the pressure point. or 5 mph (10 km/h): press rocker switch up or down beyond the pressure point...

    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...

    Other information:

    Mercedes-Benz GLC 2016-2022 Owners Manual: Using map functions


    Multimedia system: Navigation Setting the map scale To zoom in: tap twice quickly with one finger on the media display. To zoom out: tap with two fingers on the media display. Moving the map Move one finger in any direction on the touchscreen...

    Mercedes-Benz GLC 2016-2022 Owners Manual: Overview of indicator and warning lamps


    Some systems will perform a self-test when the ignition is switched on. Some indicator and warning lamps may briefly light up or flash. This behavior is non-critical. These indicator and warning lamps indicate a malfunction only if they light up or flash after the engine has been started or during a journey...

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