I would LOVE for America to design and build walkable cities, I would LOVE to ditch my car forever and rely on a robust public transportation system. I HATE driving, and the pollution cars make and YES your suggestion would be a GREAT solution.

Turn 40% of a cities roads into walkable lanes with solar panels. That fixes the ambient dust grease problem, provides significant footage for panels, and makes the environment and social atmosphere more pleasant.

I am fully all for your idea and would donate to any organization that has the capacity and interest to get it done.

Cities are for people, not for cars.