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
Child safety seat not required to be fitted with seat belts on all seats. All child restraints must meet the standards set by the NZ Transport Agency. There are different marks to indicate this approval from the safety perspective. Approved marks/symbols are shown in the table below: The number after 'E' in the ECE 44 standard indicates as to which country certifies the child restraint. Hence the number differs between countries. The EU (European Union) also has similar symbols to indicate safety standards for children travelling in a vehicle. From September 18, 2006, All children under the age of 12 have to use