When growing up, society. The contact between the people in a society with more and more complex, more intimate. Machine tools used in life, there is more, much more social conflicts. In a manner that is not enough, but assimilated so there must be a rule that the law came up immediately to correct any problems that arise. For example, traffic rules, but before I saw it on a wooden cart Thailand avoiding themselves without walking right to left are close, because it's not going to travel this country quickly left. The other car was right there is no danger to the right ยก็ saga. But when the invention of the automobile and the way the garden cart might crash dies. Therefore, when a new event is a car, traffic rules have a cart does not. Traffic rules need to be set up. In the countries of Thailand, traffic rules enforcement in area in England, driving the left. The foreign ground forces in Europe, driving right.
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