The laminated glass seems like a gimme.Big safety items
Brakes on each axle, with redundant hydraulic circuits. Extra points for being fade resistant. If you can stop, you won't hit objects.
Seat Belts. So you don't get ejected if you do hit something
Laminated Safety glass. For when belts aren't worn, and you don't get cutup on regular glass.
positive door latches, so door won't open in a crash
Padded Dashboards and collapsible steering columns. So you don't get impaled or beat your head against a steel dash, even if belted in
Fuel tanks moved away from the cowl or under the front seat.
These simple items didn't all come together til the 1960s, and could have been done decades earlier.
But Safety didn't really sell, Styling and Power did
I think it's market indirectness. Buying a car is a complex transaction. You don't get to pick stuff a la carte. And unlike shopping at the grocery store, where the economic theory is that you have balanced your overall utility and are indifferent on how your last dollar is spent, with cars or housing and perhaps other large purchases as well, sometimes people will freely admit that they have made a mistake.
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