you guys seen this? top ten per some survey
http://www.pistonheads.co.uk/news/default.asp?storyId=215151 Tailgating, 66 per cent
2 Failure to indicate, 62 per cent
3 Dangerous overtaking. 57 per cent
4 Jumping traffic lights, 35 per cent
5 Middle-lane hogging, 34 per cent
6 Dangerous late-braking, 31 per cent
7 Hesitant driving, 31 per cent
8 Undertaking, 30 per cent
9 Fast-lane hogging, 25 per cent
10 Being slow away from traffic lights, 21 per cent. [/li][/list]
Interesting that the higher rated ones I would classify as traits of more "assertive" drivers who believe themselves to be the "more competent" road user. i.e. 1-4, 6 and 8.
From that I deduce that incompetent road users clearly make up the majority of people out of the roads which sounds about right!