What about people who won't enter box junctions even when their exit is clear? I had a standup row with an old guy who refused to enter a junction while the filter light changed 3 times. I had time to google the relevant information on my Blackberry before hitting him on the forehead with it.
The snipers are a good idea, and you should do like they do in Japan. After you've faced a firing squad, your family receive an invoice for the bullets. Genius!
I'd put snipers at mini-roundabouts too. Anyone that stops when it's their right-of-way… Pow! Pow! Pow! In fact, anyone who so much as glances to their left… Pow!
And rather than making a big song and dance when a pedestrian gets hit by a car and they're at fault, they should be ridiculed. Made a mockery of. It's the only effective way to raise standards.