Pete317 wrote:
I don't think that near misses are a very good indicator of driving quality either. While it may be true that driver quality can turn a certain proportion of near misses into far misses (if you like), the number is principally determined by the number of hazards one encounters.
Putting it another way, if a driver spends a lot of time driving along narrow streets where there badly-parked cars, lots of concealed exits and children running around, they can expect to have a lot of near misses - whereas if they spend most of their time on quiet motorways then they can expect to have few.
What would be a measure of driver quality is the ratio of accidents to near misses - but, as you said, accidents are too infrequent to be usefully measured.
I wished I'd added 'mistakes and surprises' to my last post in this thread.
We're looking for low level incidents in the risk triangle - if we can make them less frequent we can seriously hope and expect to have fewer crashes.
I don't agree that driver quality defines the ratio of near misses (or mistakes or surprises) to crashes. In some cases it might, but the difference between a near miss and a crash is usually luck+the general 'error tolerance' of the road safety system. Your statement is close to the classic boy racer assumption: "I can get away with it because I have quick reactions". That assumption scares the hell out of me.
Near misses and crashes are mostly the results of Observation, Anticipation and Planning (OAP) failures - as such they are highly similar in cause.