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 cars. Drivers adapted quickly and only a small number of traffic accidents happened due to the switch with only one recorded fatality in Prague. Right hand traffic was already introduced in Slovakia by a decree of the government of "autonomous Slovakia" within Czechoslovakia in late 1938. Buses in the capital Bratislava were adapted in 1939, and the last roads in Slovakia switched to the new system in 1940/1941. The areas which are nowadays the southern border regions of Slovakia were subsequently part of Hungary (under the terms of the First Vienna Award), and did therefore change to right hand traffic