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Mountain road construction road construction in our country has an important role , the paper through the mountains unique natural geography , topography, environmental characteristics, and scholars from home and abroad on the mountain road alignment design experience and methods of research on China's western mountains road alignment design and precautions were systematically discussed . In this paper, the specific circumstances of the western mountains , according to local conditions in the area proposed road alignment design should consider the seven-point basic principles, namely: line selection principle , the principle of the surrounding environment , graphic design principles , design principles longitudinal , cross-sectional design principles , climbing lanes and hedge lane design principles , the old road reconstruction principle, which the western region for guiding the design of road alignment reference ; Chamdo region to State Road 318 , for example, some of the old road after an investigation concluded the old road situation proposed alterations to the original form of the difficulties of the old route lots, including horizontal alignment , vertical surface slope and cross-sectional width , etc., and the investigation of a local road reconstruction program was comparison , concluded alterations reasonable solution of the section ; the road alignment design and traffic safety, relationships , focusing on analysis of the plan, profile , a combination of horizontal and vertical alignment , cross-sectional , sight and other major elements of the impact on traffic safety , combined with our specification propose appropriate alignment design to ensure safety recommendations . Summed up the mountain road signs and markings to set principles and with small radius curve , grew up slope road, tunnel and other sections , for example, illustrates the three kinds of road signs and markings set up and pay attention. Furthermore thesis that, for mountain roads own characteristics , the proposed indicators should be around for linear flexible application , best to specify the appropriate design specifications.
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