[supertrope]

When the implied value of dismounted people is high enough, better design will happen.

Car drivers are forced to drive 20 MPH near schools during school opening and closing times. In tourist districts pedestrian safety and accessibility is favored over being able to drive an SUV 40 MPH down a street. In neighborhoods filled with relatively politically empowered people, roads are never straight to discourage speed, speed bumps are added, stop signs are added, and there can even be focused police traffic enforcement.

If an area has an 8 lane wide stroad with a 45 MPH speed limit then it's implied that the lives of drivers speeding through are valued over those who live in the neighborhood.

[shiroiushi]

So everything really depends on the locality and the local politics. So a few unusual places get designed for better safety, and the vast majority get the opposite. Most efforts at slowing motor vehicles down, or making them more inconvenient, are met with angry voters.