Make it illegal to use private vehicles in urban areas, except for on specific ingress/egress routes. Bolster public transit.

Most drivers are using their car to scoot around 5-10 miles. Make them walk (yes not everyone can; they have friends and family, care workers, etc). Invest in infrastructure to backfill gaps that make walking onerous.

There was measurable improvement in air pollution during Covid lockdown. We'll hate it now but thank ourselves when we're 70 and a little less anxious about environmental collapse.

Cars are great for road trips but a massive pollution and burden on urban infrastructure.

Rip up superfluous sidewalks then (aka heat storage. Plus concrete is worse for joints) and leave the avenues/streets not designated for ingress and egress for bikes, small delivery vehicles, handicap accessibility.