knowing where to stop at a stop sign(like before the white line, at the line, or a little after the white line)
how many feet something can stick out of the back of your vehicle before you have to put a flag on it.
how many mph a construction vehicle or tractor can go
which way to turn you wheels when you park uphill or downhill, with or without a curb
and what differnt signs mean (do not enter, yield, no u turn, etc,)