The fastest way to do that is to put size limits on personal vehicles. There has been study after study showing that the larger and heavier cars get the greater the risk to pedestrians. Pedestrian fatalities have almost doubled over a decade.

https://arstechnica.com/cars/2023/08/how-cities-can-stem-the...

> Pedestrian fatalities have almost doubled over a decade.

Requiring cellphones to disable themselves in cars might be even more effective.

What about the studies on deaths and injury with smaller vehicles only involving another vehicle? My guess is that it's much higher. Most families with kids want larger vehicles for exactly this reason.