ECO Assist is active only in drive programs 
and 
.
ECO Assist analyses data for the vehicle's expected route. This allows the system to optimally adjust the driving style for the route ahead, save fuel and recuperate. If the system detects an event ahead and the vehicle nears the event, ECO Assist will calculate the optimum speed for maximum fuel economy and recuperative energy based on the distance, speed and downhill gradient.
If a route event that can be dealt with more efficiently by adjusting your driving style is detected ahead, corresponding symbol will be displayed.
In addition, the 
symbol will be displayed until you take your foot off the accelerator or until you have passed the route event.
Symbol will disappear as soon as ECO Assist cannot identify any further recommendations from the route ahead.
Roundabout 
S-bend 
Sharp bend 
T-junction 
Downhill gradient 
Vehicle in front 
Speed limit
Only route event "vehicle in front" will be displayed in drive program .
If the calculated route is adhered to when route guidance is active, ECO Assist will operate with greater accuracy. The basic function is also available without active route guidance. Not all information and traffic situations can be foreseen. The quality depends on the map data.
ECO Assist is only an aid. The driver is responsible for keeping a safe distance from the vehicle in front, for vehicle speed and for braking in good time.
If there is poor visibility, e.g. due to insufficient illumination of the road, if there are highly variable shade conditions or in rain, snow, fog or heavy spray.
If there is glare, e.g. from oncoming traffic, direct sunlight or reflections.
If the windscreen in the area of the multifunction camera is dirty, or if the camera is misted up, damaged or covered.
If the traffic signs are hard to detect, e.g. due to dirt, snow or insufficient lighting, or because they are covered.
If the information in the navigation system's digital map is incorrect or out-of-date.
If the signs are ambiguous, e.g. road signs in roadworks or in adjacent lanes.