[timewizard]

You'd be correct. At least as far as fatalities are concerned. 50% of all fatalities involve drugs or alcohol. Around 50% of all fatalities are single vehicle accidents though. 15% are motorcycles. 15% are pedestrians.

And of course around 80% involve youth, testosterone and horsepower in some combination. The rest are almost always weather or terrain related in some way. Massive pileups on the highway in the winter and upside down vehicles on waterways in the summer.

Very rarely does a fatal accident happen without several factors being present.