Its easy for stirling moss to say that - he can afford a chauffeur, or to take the retest ad infinitum. Maybe there should be a free test that everyone takes every 10 or 15 years?
Hate to be dull, but its not caravans that seize the roads up at holiday time - in fact, by slowing down the general trafiic they reduce the accident rate significantly, which means you may get there a few minutes later but at least you'll less likely die along the way.
If you applied that rule to trucks the economy would seize up.
So, topskills, all in all your idea is a load of balls

Lets face it, the public transport network in this country is a disgrace.