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| Design of Large Longitudinal Slope Based on French Specification |
| LI Wen-bo |
| China Railway First Survey and Design Institute Group Ltd, Xi'an, Shanxi 710043, China |
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Abstract Research purposes: To adapt the terrain condition of mountainous area, the large longitudinal slope often has to be built to the highway in mountain area. For building the large longitudinal slope, there are many restrictions stipulated in the specifications at home and abroad. However, the traffic accidents caused by the braking failure of the heavily loaded vehicle in down slope still happen from time to time. The investigation shows the incidence of the traffic accident happened in the large longitudinal slope in France is much lower than China because the French specifications are more rational and effective. Based on inducting and analyzing the cases, this paper analyzes the reason for the braking failure of the heavily loaded vehicle in down slope, presents the risk indicators of the large longitudinal slope based on referencing the current French specifications and relevant provisions and gives the measures for reducing the driving risks for the purpose of providing the reference to highway design.
Research conclusions: In the highway's section with the large longitudinal slope of more than 3%, the gentle slopes should not be designed frequently. The emergency lane should be built when the elevation difference of one large longitudinal slope reaches at 130 meters. In addition, the warning signs should be added and the slow lane should be built in the conditional section to reduce the driving risk and protect the driver and the other people.
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Received: 04 May 2012
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2013, Vol. 30 
