In America: There are many more cars than in China. Maybe the number of cars in California is the same as the number in China. But there are fewer traffic jams and accidents in America than in China. We hardly see traffic police in the street, but all cars obey traffic rules strictly , and people hardly find that a car does not obey traffic rules in the street. About America traffic rules, there are many better terms , such as: 1. Stop line: There are stop line in all crossing without traffic lights(some have two stop lines and others have four stop lines); all cars must stop while meeting the stop lines. 2.Traffic lights: There are traffic lights in the crossing of the road .Cars may almost turn every direction. the traffic lights can give signals step by step including u-turn . There is a kind of middle lane of turning left. When a car wants to turn left in the road, he may enter into the middle lane of turning left and give a signal of turning left. When he thinks being safe he may turn left. 3. Specific item: Such as parking, there are three kinds of lines (its color are white, blue or red) in the roadside. Every line may park different kinds of cars. There are streets in some residential  areas, and no car can park at any time or any period time. 4. About the priority   of passengers and cars: At any case, passengers have the priority to cars. But only after passengers have passed the road and gotten the top of sidestep, cars may go ahead. In general, traffic rules of America are very specific, convenient and safe. This passage mainly talks about  _
the priority of passengers and cars the traffic lights the stop line American traffic rules