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초록· 키워드

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While a great deal of automobile accidents are caused by the carelessness of drivers, a more careful study illustrates that another major cause for these accidents can be found in improper road conditions and poor transportation facilities. Visual distances is one of the important factors in the geometric design of roads. In particular, the visual distance for stopping is very important in the design of vertical and surface alignments. It is also vital in establishing control and operational methods for intersections which tack roads or traffic lights. Deceleration and the friction coefficients of tire and surface play an important role in calculating the visual distance. In other words, when the friction coefficient is smaller, the safety stop visual distance must be longer. In contrast, when the friction coefficient is larger, the design standard for visual distance becomes shorter. The road traffic safety authority has recently studied the stop friction coefficient and the results has highly different from the prices set by American Association of State Highway and Transportation Officials(AASHTO). In this research various various test automobiles are used separately to study speed, roads, and road surfaces. Then the results are analyzed and compared with similar tests and related tests conducted in the past.

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UCI(KEPA) : I410-ECN-0101-2009-556-015152007