Excessive speed plays a major role in as much a one fifth of all fatal traffic accidents, according to the foundation. To help reduce those accidents, the foundation. To help reduce those accidents, the foundation will carry its tests in areas where speed-related hazards are the greatest curves, exit slopes, traffic circles, and bridges.

　　Some studies suggest that straight, horizontal barspainted 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.

　　Cheverons, 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.

　　The passage mainly discusses ________.

　　A a new way of highway speed control

　　B a new pattern for painting highways

　　C a new way to training drivers

　　D a new type of optical illusion

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