Of course, copying these countries will take time, especially because half the problem is the terrible drivers education and lax enforcement which precludes quite a few measures.
Things that could be done right now are:
* designing roads to calm traffic (bends and such): highly effective at reducing pedestrian/cyclist accidents
* building proper separated bike paths
* mandatory inspections in all states. a non-negligible % of accidents are caused by defective vehicles
* mandating and actually enforcing minimum following distance on highways
* banning modifications like steel plate grills (basically a human-crushing ram)
* scrapping the entire tax and regulation scheme that lead to the size wars in trucks and SUVs
Then there are things like replacing more STOP signs with YIELD, roundabouts, giving bike paths green lights together with turning traffic (requires drivers to look in their blindspot and yield) and lane discipline. Those broadly reduce frustration and fatigue which helps people stay calm.