The subject innovation is to carry out the role that relates to a hollow median portion is formed, it is provided in the center or the periphery of the road in detail the vehicle is prevented from departing from the road, and also, the phases separated, hahaengseon.; The subject innovation for realizing this is, the vehicle is prevented from leaving the road and, in the median portion hollow to perform the role of separating the upper and the hahaengseon formed, the median is, by bending using a steel plate, and the inside the hollow portion is formed, and an upper portion protruding toward the opposite sides, respectively so that the engaging shoulder room, but bending the lower portion adjacent to the center thereof to have a predetermined slope, toward the lower portion is characterized in that is formed such that its width is gradually widened.
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