So apropos of the first, all passenger vehicles or the like must have a big LCD screen on the dash and camera(s) in the back to help you see if you're about to back over a child.
1970s also required passive WRT to the front passengers restraints, which universally became airbags. Except the insane harridan in charge of this required they be so powerful they'll outright kill short women and children, so that they'd also maximally protect those who refuse to wear seatbelts (and I knew a short-ish woman who's jaw got busted by one in a minor parking lot accident). And, yes, she was told by auto manufacturers this is exactly what would happen.
"5 mph car bumpers" save on auto repairs, but by now have to add a couple of thousand US$ to the price. I can go on and on ...
also see the chicken tax: Which again due to bad regulations make it hard to sell smaller pickup trucks.https://en.wikipedia.org/wiki/Chicken_tax