I know my faults when i'm driving, from two wheels 200kilo thru to twelve wheels 40 odd ton, i tend to drive fast but i do check my mirrors and have not caused carnage in MY wake, why do a lot of people sit at traffic lights in pole position with their handbrake on, neutral gear putting their lippy on, the lights change to green, by time they've selected first gear, checked their mirrors, put their seat belt on and so on three cars make the lights before they change again.