Seat belt that required a particular technical approach would rapidly become dated as motor manufacturers would tool up for a particular standard which could not easily be changed. For example, in 1969 there were competing designs for lap and three-point seat belts, rapidly tilting seats, and airbags being developed. But as countries started to mandate seat belt restraints the global auto industry invested in the tooling and standardized exclusively on seat belts, and ignored other restraint designs such as air bags for several decades As of 2016, seat belt laws can be divided into two categories: primary and secondary. A primary seat
Seat belt legislation enforcement seatbelt laws then regular youth seatbelt use would be nearly universal and youth fatalities would fall by about 120 per year." A number of groups and individuals are opposed to seat belt legislation. The most common grounds for opposition are: The most common basis for disputing estimates of the benefits of seat belts is risk compensation and risk homeostasis, advanced by researchers John Adams and Gerald Wilde. The idea of this theory is that, if the risk of death or injury from a car crash is reduced by the wearing of seat belts, drivers will respond by reducing the