I find a good comparison to the roads is supermarkets.

How often to people push their trolleys in front of people, rush down the isles. bounce off the shelves and other people carts.

Last weekend a woman chatting on her mobile phone pushed her cart down the centre of the isle at speed forcing everyone to get out of her way. teh next isle had a bloke with his trolley parked across the isle and ignoring everyone who wants to get past.

If people treat other like this when they can be seen and interacted with, what chance do we have of them modifying their habits when they a faceless box on the road.