To be clear, the money is already being spent, it’s just a question of what we make the priority. Even just keeping the current roads useable costs billions of dollars, let alone the amount of money spent on highway expansion (which, due to induced demand, causes even more traffic).

In 30 years, every road that exists currently will have been replaced. The question is if it should be replaced with another road, or should some of them have larger sidewalks, bike lanes, bus lanes. Amsterdam has been doing this for decades and it’s going very well. They spent money that would’ve been spent rebuilding a road on making it a better general transportation option.