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
March Across the Belts signed by the two parties. The March Across the Belts was a risky but successful gamble which turned out to be entirely to King Charles X Gustav's benefit. The news of the victory spread quickly; it was an achievement that drew admiration all over Europe. For Denmark, the outcome of the treaty of Roskilde was disastrous: the entire eastern part of the kingdom (Scania, Halland, Blekinge, which are still part of Sweden; and Bornholm, which later reverted to Danish rule) was ceded to Sweden, and Denmark's existence as an independent state lay in doubt. March Across the Belts The March