The problem is very much political with a move away from highways design focusing on strategic mobility, the movement of people and goods over long distances, to sustainable mobility, the movement of people over short distances (0-5 miles) and the provision of systematically safe infrastructure https://www.youtube.com/watch?v=5aNtsWvNYKE

It's a really really hard political problem to solve as the impacts are measured in decades but the returns are huge.

From a technology point of view, the solution is the bicycle.