阅读理解In America, there are many cars. But there are few traffic jams and accidents. We hardly see traffic police in the street, but all drivers follow traffic rules strictly, and people hardly find that someone does not follow traffic rules in the street.
About American traffic rules, there are many good terms, such as:
Stop lines: There are stop lines in all crossings without traffic lights (some have two stop lines and others have four stop lines). All cars must stop while meeting the stop line.
Traffic lights: There are traffic lights in the crossing of the road. Cars may almost turn every direction, and the traffic lights can give signals step by step, including U-turns(掉头), There is a kind of middle lane(车道) of turning left. When a driver wants to turn left on the road, he may enter into the middle lane of turning left and give a signal of turning left. When he thinks it's safe, he may turn left.
Specific(明确的) items: As for parking. there are three kinds of lines (their colours are white, blue and red) in the roadside. Every line may park different kinds of cars. There are many streets in some residential areas (住宅区), but no car can park there at any period of time.
About the priority(优先权) of passengers and cars: In any case, passengers have the priority to cars. And only after passengers have passed the road, cars may go ahead.
In general, the traffic rules of America are very specific, convenient and safe.