> I was surprised to learn that seat-belt usage took so long to take on.

Look up the automatic seat belt fad from the 80s and 90s. To make a long story short, there's a reason why they fell out of favor; you still had to manually put on your lap belt, and a lot of people who normally would wear their seat belt correctly didn't realize they had to wear a lap belt.

Also, no one wears seat belts in India. When a car came to pick me up, there was no seat belt in the rear seat. The driver had tucked them under the seat, so I made him pull them back out. As we drove along a semi-freeway, the center divider was giant potted plants instead of a guard rail. Good luck if you happen to drift into one of those without a seat belt.