Activating/deactivating DSR
Requirements:
You are driving at 40 km/h or slower.
If the current vehicle speed is too high, the Max. speed 40 km/h message appears in the multifunction display.
Active Distance Assist DISTRONIC is deactivated.
To activate:
pull rocker switch 
. Indicator lamp 
lights up.
The DSR symbol will appear on the multifunction display.
To deactivate:
pull rocker switch . Indicator lamp and the DSR symbol go out.