I have this idea for a "video game" in which the player drives around and racks up "points" in the form of fines and penalties for all the wrong moves he makes. Make it fun, but educational. I frankly believe that many drivers don't know the rules at a 4-way stop; don't know NOT to turn right into the left lane; that turning left into the left lane is recommended but not required; that you must STOP at a red light even if you're turning right; that you stop -- or at least slow down -- for crosswalks when another car is stopped there because there may be a pedestrian crossing; that you stop for pedestrians until they either get across the street or to a safety island; and that speed limits are MAXIMUM, not minimum speed! The list goes on.

My idea is to show drivers in a fun way all the thing they may be doing wrong, without being preachy about it. "Oh, you've just racked up a potential $10k in fines and a loss of your license for 3 years" (or whatever).