Agaricus Bisporus
The car driver vs pilot a analergy is an interesting one and deserves futher investigation.
As most of the general public live a 9 to 5 lifestyle, going to sleep at night and working during the day I would guess that would have a large influence on the numbers, perhaps if you look at the numbers for those who have jobs that require nightshift work you might find things are a little more deferent I would hazard a guess that the road accident numbers for Heath care workers is higher than for the public at large.