***Thirty thousand people die each year in car crashes. ***
I have an old 1956 article somewhere that claims over NINETY THOUSAND people in the USA died in car wrecks in 1955.
I guess the answer is more government. </sarc>
No one was wearing seat belts back then.
Tires lasted...what? Five thousand miles?
And many roads were still unpaved.
In 1955 the total amount of auto accident deaths was 36,688. The rate of deaths per 100,000 people was twice as high at that time than it is currently. That article you mentioned was way off the charts.
https://en.wikipedia.org/wiki/List_of_motor_vehicle_deaths_in_U.S._by_year
Now we have widespread marijuana use, so we're safer. :)