Genuine question: we have a lot of research on how not to die in traffic (lower speeds around pedestrians, bicyclists stopped ahead of cars in intersections, children in backward facing seats, seatbelts in all seats in all types of vehicles, roundabouts in high-speed intersections, etc.)
Why are more parts of the world not taking action on it? These are not very expensive things compared to the value many people assign to a life lost, even in expected value terms.