OT
The epidemic of deaths in and around cars led to the government regulation.
National Traffic and Motor Vehicle Safety Act - Wikipedia
Drunk driving in the United States - Wikipedia
Tetraethyllead - Wikipedia
I'm glad we don't live in the unregulated world. It would be nice if we could make the regulations shorter and sweeter, and with current technology we probably can. For instance, nowadays we could simplify a lot of the regulations to:
-- no driving with any detectable alcohol level in your blood
-- no fuel-burning cars at all
-- cars must have sensors to detect things in front of them and must safely stop rather than crashing into things
+ I would add cheap and accessible transportation. I think Uber and lift had a great impact on lowering DUI.