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 speedrelated hazards(危险)are the greatest—curves, exit slopes, traffic circles, and bridges.
Some studies suggest that straight, horizontal bars painted across roads can at first 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 bar.
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.
【语篇大意】 本文主要介绍司机视觉与路况。
48.The passage mainly discusses ________.
A.a new way of highway speed control
B.a new pattern for painting highways
C.a new approach to training drivers
D.a new type of optical illusion
答案 A [主旨大意题。文章的主题句往往位于文章的开头或是结尾,本文就在第一自然段。]
49.On roads painted with chevrons, drivers tend to feel ________.
A.they should avoid speedrelated hazards
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