It seems like it would compared to a wild west situation where everyone is doing lots of drugs/going as fast as possible, but in our current society cracking down further offers no further benefits and may come at additional costs.

For example:

Automatic breaking technology on cars that can detect people who the driver might not be able to see (child running out from in-between parked cars).

Better selective enforcement of speed limits so that people pay a bit more attention. When an empty country road says 25mph due to a speed trap, it reduces the trust people place in speed limits, meaning they won't respect the 25mph speed limit as much even when it is in a school zone where children are constantly crossing the street.

Better side walk design. I shouldn't be only two feet from a speeding 2 ton object even when everyone is following the law correctly. Having space between the road and sidewalk helps. Maybe add some trees and other objects that will stop a drunk driver who runs off the road.

Bike paths for those riding bikes. Also separated from the road.