There's an Austria paper that looked into the accident cause "speeding" (nicht angepasste Geschwindigkeit) means across the german-speaking countries. The results boiled down to "it depends" on the officer typing in the data as there aren't any reviews or such. There's good data on other accident aspects like the seat-belt-usage you mentioned (and it's shocking how many people die because they are too lazy to use their seat-belt) but those aren't down to subjective judgement on the spot.
Good data is needed as a few accident causes do tend to be common in certain road/location conditions and those can be fixed. For example while the total number of accidents on train crossing is low (15~20 fatalities per year) in Austria, all of them are the driver's fault and almost all (except for massive idiot drivers) can be fixed by installing automatic gates on all crossings.
Good data is needed as a few accident causes do tend to be common in certain road/location conditions and those can be fixed. For example while the total number of accidents on train crossing is low (15~20 fatalities per year) in Austria, all of them are the driver's fault and almost all (except for massive idiot drivers) can be fixed by installing automatic gates on all crossings.