The speed warning function can help you keep below a pre-set maximum speed.
The speed warning function will warn you if the vehicle exceeds the pre-set maximum speed. The system gives an audible warning signal if the set speed is exceeded by about 3 km/h. At the same time, a warning lamp will light up in the instrument cluster display. On some models the warning lamp may look slightly different.
The speed warning function has one or two* different warning speeds, which operate independently and serve slightly different purposes:
Speed limit warning 1 
With speed limit warning 1, the maximum speed can be changed while driving. The speed limit that has been set remains stored until the ignition is switched off, or until it is changed or cleared.
The warning lamp for speed limit warning 1 will light up in the display if you exceed the set speed. It goes out again if the speed is reduced below the set speed.
will light up in the display if you exceed the set speed. It goes out again if the speed is reduced below the set speed.The warning lamp also goes out if the speed is increased to more than about 40 km/h above the set speed for at least 10 seconds. This cancels the speed limit that was originally set.
Setting speed limit warning 1 Link.
Speed limit warning 2 
*
*You are recommended to store this speed limit warning if you always wish to be reminded of a particular speed limit. This could be when driving in countries with general speed limits, or if you need to keep below a particular speed when winter tyres are fitted, etc.
The warning lamp for speed limit warning 2 will light up if you exceed the pre-set speed. Unlike speed limit warning 1, the warning lamp only goes out once the road speed has dropped below the stored value again.
will light up if you exceed the pre-set speed. Unlike speed limit warning 1, the warning lamp only goes out once the road speed has dropped below the stored value again.Setting speed limit warning 2 Link.
Note
Please bear in mind that, even with the speed warning function, it is still important to keep a check on the car's speed with the speedometer and to observe the statutory speed limits.