Beyond seat belts - it boils my brain how head rests for car seats weren't made mandatory by law very roughly back in the 1940s. By then there must have been a large number of whiplash cases due to sudden stops and crashes. And g forces aren't rocket science. It's basic physics shit. I don't know when the legislation was finally passed. Around the early 1970s?

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Ninja edit

Wikipedia

[Head rests] were mandated by the U.S. National Highway Traffic Safety Administration (NHTSA) in all new cars sold in the U.S. after January 1, 1969.