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
Switch to right-hand traffic in Czechoslovakia as late as 1941, together with the rest of wartime Hungary. Switch to right-hand traffic in Czechoslovakia The switch to right-hand traffic in Czechoslovakia was a change in the rule of the road in 1938–1939. Before 1938, Czechoslovakia drove on the left. In 1925, Czechoslovakia accepted the Paris convention and undertook to change to right-hand traffic "within a reasonable time frame". In 1931, the government decreed to change over within five years, which did not happen. The main obstacles were financial cost and widespread opposition in rural areas. In November 1938, parliament finally decided to change to right-hand traffic with