[DoingIsLearning]

> Also, cars have largely gotten bigger and heavier

... In the US/Canada. This is for the most part a self-contained cultural problem.

SUVs/trucks numbers are a small percentage of the vehicles on the road elsewhere in the world, mostly because there is no space for them in the road/city infrastructure in most other places.

[frosted-flakes]

Size is only one factor of weight. Safety improvements have also increased weight, even if the car stayed roughly the same size.