I have good news and bad news about America’s roads. The good news is the number of people killed in traffic collisions fell by almost 4 per cent in 2023. The bad news is the mortality rate on US roads is still 25 per cent up on a decade earlier, and three times the rate of the average developed country.
Most of the explanations commonly put forward for why US roads remain so deadly focus on broad structural factors such as vehicle size or time spent on the road, but a review of the evidence suggests this may be mistaken. Last year’s improvement is a case in point. Two reasons often cited as key causes of poor US performance both worsened: the total number of miles driven by Americans increased, and US cars continued to grow larger. Yet fatal collisions still declined.
