As a slightly related note. There is (it seems, I have to add, I don’t have an actual data source, but read about this in a couple of papers) a fair bias over speeding being listed as a cause of accidents.
This should be because most people would drive around/above the limit —> speed is indicated as one of the causes of the accidents —> speed limit is lowered —> more people drive slightly above it —> repeat.
Over the number of accidents, I do trust Wapping if he says so. The article reports a percentage reduction (80% of an initial figure we are not disclosed, could be 2), but I don’t know those areas at all.
There is a fair amount of people crashing head on on southern shores as well, and that is due to people not being able to negotiate an hairpin without invading the other lane. It’s an infinite source of fights/discussion on some bike forums down south
Most of those are traveling way below the limit instead (15/20kmh at most) and still put others (and themselves) at risk.