In 40 years of driving cars and bikes, I have had only one accident. That was way back in the day, my beetle met a horse in the early hours of the morning. The horse removed the roof and had we been wearing seat belts, I and my passenger would have been decapitated.

But I don't use that as an excuse. Both my cars warning buzzers are so loud and annoying that it is nigh impossible to ignore.

My son's Alfa on the other hand will wreck your ear drums if you ignore it.

The original question about relative speed is a really good one. But there is a bit of a flaw there, in that no two drivers have the same skill sets.

I was a clerk of the course for a number of years, up to national championship level, and this issue was demonstrated at every race. Situations that would cause some drivers to lose the plot, are taken in stride by others. I also see this when my son drives me; he drives really fast (without speeding, he just does things very quickly) but way safer than me. He anticipates problems far better and sometimes is aware of issues before they happen, where I only became aware of them after they happen. So, regardless of the speed, he is always better equipped than I to deal with anything.

Then, and this is not a criticism of anybody, people should really, really try to keep their cool when driving. There are far more d00ses than non-d00ses and getting upset is exhausting . I generally have a short temper, or so I am told, but for some reason a'holes never get me annoyed; at most I will shake my head. It's not something I learned or anything, it just is that way. Now when either my wife or son drive, I reckon their blood rush threatens them with a seizure and it achieves absolutely squat. I find I can criticize and curse, but I don't get angry, and anger and driving don't mix well.