Active Distance Assist DISTRONIC maintains the set speed on free-flowing roads. If vehicles in front are detected, the set distance is maintained, if necessary, until the vehicle comes to a halt. The vehicle accelerates or brakes depending on the distance to the vehicle in front and the set speed. The speed and distance to the vehicle in front are set and saved using the steering wheel.
Vehicles without Driving Assistance Package: 20 km/h - 200 km/h
Vehicles with Driving Assistance Package: 20 km/h - 210 km/h
Adjusts the driving style depending on the selected drive program (fuel efficient, comfortable or dynamic)
Initiates acceleration to the stored speed if the turn signal indicator is switched on to change to the overtaking lane
Vehicles with Driving Assistance Package:
Reacts to stationary vehicles detected in urban speed ranges (except bicycles and motorcycles)
Takes one-sided overtaking restrictions into account on motorways or on multi-lane roads with separate carriageways (country-dependent)
Vehicles with Active Parking Assist and Driving Assistance Package: if the vehicle has been braked to a standstill on multi-lane, separate carriageways by Active Distance Assist DISTRONIC, it can automatically follow the vehicle in front, driving off again within 30 seconds. If a critical situation is detected when driving off, a visual and acoustic warning is given indicating that the driver must now take control of the vehicle. The vehicle is not accelerated any further.
Observe the notes on driving systems and your responsibility; you may otherwise fail to recognise dangers More.
(white): Active Distance Assist DISTRONIC selected, specified distance set - (green): Active Distance Assist DISTRONIC active, specified distance set and vehicle detected
: Route-based speed adaptation active More.
The stored speed is shown along with the permanent status display and highlighted on the speedometer. When Active Distance Assist DISTRONIC is passive, the speed is greyed out.
On motorways or high-speed major roads, the green 
vehicle symbol is displayed cyclically when the vehicle is ready to pull away.
If you depress the accelerator pedal beyond the setting of the Active Distance Assist DISTRONIC, the system is switched to passive mode. The suspendedmessage appears in the multifunction display.
The stored speed is highlighted on the speedometer. If the speed of the vehicle in front or the speed adjustment is less than the stored speed due to the route event ahead, the segments in the speedometer light up. Deactivation of Active Distance Assist DISTRONIC, as well as alterations to the speed due to manual or automatic adoption of the maximum permissible speed, are displayed in the control feedback of the multifunction display on a single line.
In snow, rain, fog, heavy spray, if there is glare, in direct sunlight or in greatly varying light conditions.
If there is swirling dust, e.g. when driving off-road or on sandy surfaces.
The windscreen in the area of the camera is dirty, misted up, damaged or covered.
If the radar sensors are dirty or covered.
In multi-storey car parks or on roads with steep uphill or downhill gradients.
If there are narrow vehicles in front, such as bicycles or motorcycles.
In addition, on slippery roads, braking or accelerating can cause one or several wheels to lose traction and the vehicle could then skid.
Do not use Active Distance Assist DISTRONIC in these situations.
If the vehicle pulls away using Active Distance Assist DISTRONIC.
If the stored speed is called up and is considerably faster or slower than the currently driven speed.
If Active Distance Assist DISTRONIC no longer detects a vehicle in front or does not react to relevant objects.
Active Distance Assist DISTRONIC brakes your vehicle with up to 50% of the possible deceleration. If this deceleration is not sufficient, Active Distance Assist DISTRONIC alerts you with a visual and acoustic warning.
when driving on a different lane or when changing lanes
to pedestrians, animals, bicycles or stationary vehicles, or unexpected obstacles
to complex traffic conditions
to oncoming vehicles and crossing traffic
As a result, Active Distance Assist DISTRONIC may neither give warnings nor intervene in such situations.