Mercedes-Benz E-SEDAN 2023 Function of Active Speed Limit Assist User Manual
The function of Active Speed Limit Assist
If a change in the speed limit of 12 mph (20 km/h) or more is detected and automatic adoption of speed limits is activated, the new speed limit is automatically adopted as the stored speed (/ page 197).
The driving 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 on 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 that are higher than the set speed are adopted.
Observe the notes on driving systems and your responsibility; you may otherwise fail to recognize dangers (/ page 170).
The system limits of Traffic Sign Assist apply to the detection of traffic signs (/ page 196). Speed limits below 12 mph (20 km/h) are not automatically adopted by the system as the stored speed. Temporary speed restrictions (e.g. applicable for a certain time or due to weather conditions) cannot be properly detected by the system. The maximum permissible speed applied to a vehicle with a trailer is not detected by the system.
Adjust the speed in these situations.
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
- Ensure that the driven speed complies with traffic regulations.
- Adjust the driving speed to suit current traffic and weather conditions.
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(/ page 187).
The following route events are taken into account:
- T-intersections, traffic circles and toll stations
- 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 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, traffic circles 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.
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:
- road’s a course not clearly visible
- road narrowing
- varying maximum permissible speeds in individual lanes, for example at toll stations
- wet road surfaces, snow or ice
In these situations, the driver must intervene accordingly.
Risk of an 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 R In the event of electronically displayed speed limitations
- Adapt the speed to the traffic situation.
Setting route-based speed adaptation
- Active Distance Assist DISTRONIC is activated.
- ECO Assist is active.
4© 5 Settings 5 Assistance 5 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 route-based speed adaptation (/ page 185).
The function of Active Stop-and-Go Assist
Active Stop-and-Go Assist helps you when in traffic jams on multi-lane roads with separate roadways by automatically pulling away within up to 60 seconds and with moderate steering maneuvers. It orients itself using the vehicle in front and lane markings. Active Stop-and-Go Assist automatically maintains a safe distance from the vehicle in front and vehicles cutting in.
Active Stop-and-Go Assist requires you, as the driver, to keep your hands on the steering wheel at all times so that you are able to intervene at any time to correct the course of the vehicle and keep it in the lane. Observe the notes on driving systems and your responsibility; you may otherwise fail to recognize dangers (/ page 170).
Active Traffic Jam Assist activates automatically as soon as all of the requirements are met: The ¬ status display appears in the instrument cluster when the function is active.
- You are in a traffic jam on a freeway or high-speed major road.
- Active Distance Assist DISTRONIC is activated and active (/ page 183).
- Active Brake Assist is available (/ page 192).
- Active Steering Assist is activated and active (/ page 189).
- Active Traffic Jam Assist is activated (/ page 187).
- You are traveling no faster than 35 mph (60 km/h).
The system limitations of Active Distance Assist DISTRONIC and Active Steering Assist apply to Active Traffic Jam Assist.
Activating/deactivating Active Traffic Jam Assist
4© 5 Settings 5 Quick Access Select
The function of Active Steering Assist
Active Steering Assist is only available up to a speed of 130 mph (210 km/h). The system helps you to stay in the center of the lane by means of moderate steering interventions. Depending on the speed driven, Active Steering Assist uses the vehicles ahead and lane markings as a reference.
- Depending on the country, in the lower speed range Active Steering Assist can use the surrounding traffic as a reference. If necessary, Active Steering Assist can then also provide assistance by driving outside the center of the lane, for example, to form an emergency corridor.
If the detection of lane markings and vehicles ahead is impaired, Active Steering Assist switches to passive mode. The system provides no support in this case.
Status display of Active Steering Assist
- Ø (gray): activated and passive
- Ø (green): activated and active
- Ø (red): system limits detected
- R Ø (white, red hands): “hands on the steering wheel” prompt
During the transition from active to passive status, the Ø symbol is shown as enlarged and flashing. When the passive state is reached, the Ø symbol is displayed in gray.
Depending on the selected vehicle settings, Active Steering Assist may be unavailable.
Steering and touch detection
The driver is required to keep their hands on the steering wheel at all times and be able to intervene at any time to correct the course of the vehicle and keep it in lane. The driver must expect a change from active to passive mode or vice versa at any time.
If the system detects that the driver has not steered the vehicle for a considerable period of time or has removed their hands from the steering wheel, display 1 appears. If the driver still does not steer the vehicle, a warning tone sounds in addition to the visual warning message. If the driver does not react to the warning for a considerable period, the system can initiate an emergency stop (/ page 190). The warning does not occur or stops as soon as the system detects that the driver is touching or steering the steering wheel.
Touch detection may be limited or inoperative in the following situations:
- The driver is wearing gloves.
- There is a steering wheel cover on the steering wheel.
If Active Steering Assist detects that a system limit has been reached, a visual warning is issued and a warning tone sounds.
Observe the notes on driving systems and your responsibility; you may otherwise fail to recognize dangers (/ page 170).
Active Steering Assist has a limited steering torque for lateral guidance. In some cases, the steering intervention is not sufficient to keep the vehicle in the lane or to drive through exits.
The system may be impaired or may not function in the following instances:
- There is poor visibility, e.g. due to snow, rain, fog, heavy spray, greatly varying ambient light or strong shadows on the road.
- There is glare, e.g. from oncoming traffic, direct sunlight or reflections.
- Insufficient road illumination.
- The windshield is dirty, fogged up, damaged or covered in the vicinity of the camera, e.g. by a sticker.
- No, or several, unclear lane markings are present for one lane, or the markings change quickly, for example, in a construction area or intersections.
- The lane markings are worn away, dark or covered up, e.g. by dirt or snow.
- If the distance to the vehicle in front is too short and thus the lane markings cannot be detected.
- The road is narrow and winding.
- There are obstacles on the lane or projecting out into the lane, such as object markers.
The system does not provide assistance in the following conditions:
- On tight bends and when turning.
- When crossing intersections.
- At traffic circles or toll stations.
- When the tire pressure is too low.
Risk of an accident if Active Steering Assist unexpectedly stops functioning
If the system limits of Active Steering Assist are reached there is no guarantee that the system will remain active or will keep the vehicle in lane.
- Always keep your hands on the steering wheel and observe the traffic carefully.
- Always steer the vehicle paying attention to traffic conditions.
Risk of an accident if Active Steering Assist unexpectedly intervenes The detection of lane markings and objects may malfunction and cause unexpected steering interventions. Steer according to traffic conditions.
Activating/deactivating Active Steering Assist
R ESP® is activated but is not intervening.
- R Active Distance Assist DISTRONIC is activated.
4© 5 Settings 5 Quick Access # Select a Steering Assist.
The function of Active Emergency Stop Assist
If the system detects that the driver has not steered the vehicle for a considerable period of time or has removed their hands from the steering wheel, display 1 appears on the instrument display. If the driver still does not actively steer the vehicle or provides no confirmation to the system, a warning tone sounds repeatedly in addition to the visual warning message. If the driver still does not respond to the warning, the Beginning Emergency Stop message appears on the instrument display. If the driver still does not respond, Active Distance Assist DISTRONIC reduces the vehicle’s speed. The vehicle is slowed down to a standstill in stages.
Depending on the country, at speeds below
40 mph (60 km/h) the hazard warning light system switches on automatically.
When the vehicle is stationary, the following actions are carried out:
- The vehicle is secured with the electric parking brake.
- Active Distance Assist DISTRONIC is ended.
- The vehicle is unlocked.
- If possible, an emergency call is placed to the Mercedes-Benz emergency call center.
The driver can cancel the deceleration at any time by performing one of the following actions:
- Braking or accelerating
- Deactivating Active Distance Assist DISTRONIC
Mercedes-Benz 2023 Top Accessories
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View Full User Guide: Mercedes-Benz E-CLASS SEDAN 2023 User Manual
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