Traffic Sign Assist detects traffic signs with multifunction camera 
. It assists you by displaying detected speed limits and overtaking restrictions in the instrument cluster.
when the vehicle changes roads, e .g. motorway exit or slip road
when a village or town boundary stored in the digital map is passed
The system displays the traffic signs valid for the vehicle model registration. A distinction is made between the valid traffic signs for a permissible gross vehicle mass (GVW) ≤3.5 t, >3.5 t ≤ and motorhome.
If the system detects that you are driving onto a section of road in the wrong direction of travel, it triggers a warning.
The camera also detects traffic signs with a restriction indicated by an additional sign (e .g. when wet).
The system can warn you if you unintentionally exceed the maximum permissible speed. To do this, you can specify in the multimedia system by how much the maximum permissible speed can be exceeded before a warning is issued. You can specify whether the warning is to be just a visual warning or an audible one as well.
Only one of traffic signs or is displayed at any one time in the instrument cluster, if necessary with additional sign . If two valid traffic signs are detected at the same time, a plus sign appears next to the traffic sign in the instrument cluster as an indication that both traffic signs are displayed in the navigation system.
Traffic Sign Assist is not available in all countries. If it is unavailable, display is shown in the speedometer.
If visibility is poor, e. g. due to insufficient illumination of the road, highly variable shade conditions, rain, snow, fog, swirling dust or heavy spray.
If there is glare, e. g. from oncoming traffic, direct sunlight or reflections.
If there is dirt on the windscreen in the vicinity of the multifunction camera or if the camera is misted up, damaged or obscured.
If traffic signs are difficult to detect, e. g. because they are dirty, covered, faded, covered with ice, damaged, badly positioned, poorly lit or twisted.
If the information in the navigation system's digital map is incorrect or out-of-date.
If signs or the road layout is ambiguous, e. g. traffic signs in roadworks, at exits and ramps, in neighbouring lanes or parallel roads.
If signs do not conform to the standard.
If signs or road layouts are specific to the country and deviate from the route guidance in the navigation system, e. g. at or beyond construction sites.
After sharp turns and tight bends, when traffic signs are outside the camera's field of vision.
If you overtake vehicles with traffic signs which are affixed or attached to them.