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
Compulsory education years, the principle of compulsory education free of charge for all. In old times, compulsory education was to master physical skills which are necessary and can be contributed to the nation. And it instilled values of ethics and social communications abilities into teenagers's minds. Plus, it would allow immigrants to fit in the unacquainted society of a new country. Nowadays, compulsory education has been considered as rights for every citizens in many countries. It is mostly used to advance the educated quality of all the citizens, minimize the students who stop going to school because of family economic reasons, and