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 between the towns and villages (Ding 13). On the other hand, it efficiently improves the quality of the facilities in schools because of the safety guarantee. However, nine-year compulsory education still has problems and needs to be improved. Most of the drop-out students quit schools because of the unwillingness of studies and bad education, instead of not being able to afford the tuition. Therefore, the improvements of Chinese compulsory education are still necessary in the modern society. The following table indicates at what ages compulsory education starts and ends, country by country. The most common age for starting compulsory education