Yes, there is a lot of correlation with safety standards (eg how much grip in various conditions tires have to provide, car safety & stability system, maintenance & road worthiness), which usually correlates to GDP.
Other main things are prob more cultural (attitude towards speeding & drunk driving, commuting alternatives, penal system, etc).
I think there are some African countries that can challenge the top US states.
https://en.wikipedia.org/wiki/List_of_countries_by_traffic-related_death_rate
older data though.
Yes, there is a lot of correlation with safety standards (eg how much grip in various conditions tires have to provide, car safety & stability system, maintenance & road worthiness), which usually correlates to GDP.
Other main things are prob more cultural (attitude towards speeding & drunk driving, commuting alternatives, penal system, etc).