I can't say it's definitely the cause, but some of the things that might play a role are that the driving test is much more strict/difficult, the minimum age to

I can't say it's definitely the cause, but some of the things that might play a role are that the driving test is much more strict/difficult, the minimum age to get a permit is 18, the highways are generally less dense, the speed limits are lower, and traffic enforcement is stricter.