On the basis of a research of relation between landform beside a road in mountainous areas and loss degree from of a vehicle rushing out of the road,a concept of road danger degree is proposed,moreover,its calculation method is presented.The rational classification of danger degree of roadsides provides bases for the accurate detemination of danger conditions of roadsides and the resonable installation of barries,thus the security level of the ordinary highways in mountainous areas may be improved.
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