[解析]
Many rules govern drivers on American streets and highways.The most common ones are the speed limit.The speed limit regulates how fast a car may go.On streets in the city，the speed limit is usually 25 or 35 miles per hour.On highways between cities，the speed limit is usually 55 miles per hour.When people drive over the speed limit，a policeman can stop them.The policeman gives them pieces of paper which people call traffic tickets.Traffic tickets tell the drivers how much money they must pay.When drivers receive too many tickets，they probably cannot drive for a while.The rush hour is when people are going to work or going home from work.At the rush hour，there are many cars on the streets and traffic moves very slowly.Nearly all American cities have rush hours.Drivers do not get tickets very often for speeding at the rush hours，because they cannot drive fast.
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