If we lowered the speed limit to 20 miles per hour country wide we would be a lot closer to zero deaths. But at what cost? We live in an imperfect world of trad

If we lowered the speed limit to 20 miles per hour country wide we would be a lot closer to zero deaths. But at what cost? We live in an imperfect world of trade offs, not perfect solutions. Even requiring people to wear seatbelts has a cost