I think one of the things not mention, is to simply have less driving. That helps a lot. Move more people onto buses, trains, bikes and walking.
In shared spaces, the more alternatives you have the more the car has to adjust to that reality and that tends to slow down cars.
And even more importantly, politically measures like 'slowing down cars' is much easier to pass if people have alternatives.
Here in Switzerland we are just fighting against the Right Wing Transport Minister who wants to make 50km mandatory in every city (but they are anti-regulation of course).
Secondly, I think these numbers only really look good, in light of them having been so horrible bad before. So much more could be done. There are 100s of streets that should simply be pedestrianized, both for economic reason and for safety reasons.
There is lots of good research going on in Netherlands, Finland, Norway and so on. In Oslo for example, they have reduced the cars in the city to a point where I was often simply walking on the street (sadly partly by moving cars underground). Sweden in Stockholm implemented congestion pricing.
Another thing not addressed here, is to keep cars light. The chance of death is much less with a smaller lower profile car. Charge higher registration and road fees to larger cars. Create maximum sizes for all public parking spots and harsh fines is somebody parks their dumb F-150 there. More can be done along those lines as well.
Narrow roads and use safer configuration. For example, never have a 4-lane road. A 3 lane where the middle is a turning lane, has the same threw-put and is safer. In general, preventing any kind of overtaking improves flow and safety.
There are so many more things that can be done. The goal has to be not just less people killed, but also less property damage and other kinds of negative effect. Zero is the acceptable number.