With less policing the problems will just get worse. The only alternative is some kind of intrusive digital nannying which is what we're starting to see.
...or you could look at what is done in countries with a far better safety record and copy it. Hint: street design has a massive effect on the speed at which drivers choose to go. Narrower lanes, curves, intersections with tight corners, raised crossings, speed humps, removing on-street parking next to intersections (daylighting), etc. all reduce fatalities.
It increases the utility of the streets for pedestrians and cyclists by, you know, not getting them killed.
Many traffic safety measures cost very little to implement, or even retrofit. You can look up what has been done in Hoboken, NJ -- no pedestrian fatalities since 2017.
...or you could look at what is done in countries with a far better safety record and copy it. Hint: street design has a massive effect on the speed at which drivers choose to go. Narrower lanes, curves, intersections with tight corners, raised crossings, speed humps, removing on-street parking next to intersections (daylighting), etc. all reduce fatalities.