Russ Swift does it without geometry and uses much less space. <a href="http://www.youtube.com/watch?v=REpXf0cmJ64" rel="nofollow">http://www.youtube.com/watch?v=REpXf0cmJ64</a> (Sorry I couldnt find it in English.)<p>The new world record: <a href="http://www.youtube.com/watch?v=P7Eqn_BiQus" rel="nofollow">http://www.youtube.com/watch?v=P7Eqn_BiQus</a> (Watch it with the sound off to avoid the screaming commentator.)
I'll have to discuss this with my teachers at drving school, maybe they'll train us in geometry too afterwards.
I see just one problem: Does this approach incorporate tolerances too? Having to touch the car behind you may not be appreciated.