Thats for adjustment of your headlight beam, ie: if you carry 5 people and cases in the boot/trunk then you set it on #3 etc. Park it in front of a wall at night, with the lights on and turn the switch and you will see the beam go up/down.
__________________ VELVET BLUE UK INDIVIDUAL , IM THE LAST
UNITED WE STAND DIVIDED WE FALL
I stepped in a plate of Pasta the other day - now I have to worry about my Carbonara footprint!