A. they should avoid speed-related hazards
B. they are driving in the wrong lane
C. they should slow down their speed
D. they are coming near to the speed limit
3. The advantage of chevrons over straight, horizontal bars is that the former ________.
A. can keep drivers awake B. can cut road accidents in half
C. will look more attractive D. will have a longer effect on drivers
4. The American Automobile Association Foundation for Traffic Safety plans to ________.
A. try out the Japanese method in certain areas
B. change the road signs across the country
C. replace straight, horizontal bars with chevrons
D. repeat the Japanese road patterns
5. What does the author say about straight, horizontal bars painted across roads?
A. They are suitable only on broad roads.
B. They are falling out of use in the United States.
C. They are ignored in a long period of time.
D. They cannot be used successfully to traffic circles.
【答案解析】
为了控制车速，减少交通事故，美国决定在公路上画人字形标志。