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 seat belt compulsory for drivers and front-seat passengers. This legislation was enacted after trialing Hemco seatbelts, designed by Desmond Hemphill (1926–2001), in the front seats of police vehicles, lowering the incidence of officer injury and death. A 2-point belt attaches at its two endpoints, and was invented in the early 1900s by Jack Swearingen of Louisville, Kentucky. A lap belt is a strap that goes over the waist. This was the most commonly installed type of belt prior to legislation requiring three-point belts, and is primarily found in older cars. Coaches are equipped with lap belts (although many newer coaches