some rules when i was young, my teachers told me how to obey the traffic rules. the government persuaded public to know more rules about traffic in order to avoid accident. the Chinese government has carried out family planning.they want to control population growth and improve the quality of the population. the policy came out in 1984. it was compulsory. the couple had only one child. the people who didn`t follow rules were fined. and their children might be in legal limbo. nowadays in some cities,where residents can have two kids( if both parents are only one children).