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  3. Believe it or not, optical illusion (错觉) can cut highway crashes. (78) Japan is a case in point. (79) It has reduced automob

Believe it or not, optical illusion (错觉) can cut highway crashes. (78) Japan is a case in point. (79) It has reduced automob

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问题     Believe it or not, optical illusion (错觉) can cut highway crashes.
    (78) Japan is a case in point. (79) It has reduced automobile crashes on some roads by nearly 75 percent using a simple optical illusion. Bent stripes, called chevrons (人字形), painted on the roads make drivers think that they are driving faster than they really are, and thus drivers slow down.
    Now the American Automobile Association Foundation for Traffic Safety in Washington D.C. is planning to repeat Japan’s success. Starting next year, the foundation will paint chevrons and other patterns of stripes on selected roads around the country to test how well the patterns reduce highway crashes.
    (80) Excessive speed plays a major role in as much as one fifth of all fatal traffic accidents, according to the foundation. To help reduce those accidents, the foundation will conduct its tests in areas where speed - related hazards are the greatest - curves, exit slopes, traffic circles, and bridges.
    Some studies suggest that straight, horizontal bars pained across roads can initially cut the average speed of drivers in half. However, traffic often returns to full speed within months as drivers become used to seeing the painted bars.
    Chevrons, scientists say, not only give drivers the impression that they are driving faster than they really are but also make a lane appear to be narrower. The result is a longer lasting reduction in highway speed and the number of traffic accidents.
What does the author say about straight, horizontal bars painted across roads?
选项 A、They are falling out of use in the United States
B、They tend to be ignored by drivers in a short period of time.
C、They are applicable only on broad roads.
D、They cannot be applied successfully to traffic circles.
答案B
解析 本题考查对倒数第2段的准确理解。文章说：“最初能让驾驶员减速一半”，“但数月后驾驶员便恢复到原来的速度”。也就是说，  垂直横线只能在短时期内影响到驾驶员的行驶速度，过一段时间就不起作用了，因此B项是本题的答案。   
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