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广西以多山著称,海拔250m以上的山丘地形,占全区总面积的64.9%。山岭区高速公路的规划设计与其他区域高速公路有着明显的不同,尤其是行车速度受纵坡影响较大。我国目前还没有一个针对山岭区高速公路运行速度的预测模型,在分析国内外相关研究成果的基础上,文章以连接南宁与友谊关的南友高速作为研究对象,收集南友高速的全线道路线形数据,并且在南友高速上选定40余处有代表性的路段,实地测得运行速度数据。通过分析速度与线形之间的分布特性,建立了能够反映广西山岭区双向4车道高速公路特点的运行速度预测模型。
Guangxi is famous for its mountainous terrain, with hills above 250m above sea level, accounting for 64.9% of the total area. There are obvious differences between the planning and design of the expressway in the mountainous area and the expressway in other areas, especially the driving speed is greatly affected by the longitudinal slope. At present, there is not a forecasting model for the expressway running speed in mountainous area in our country. Based on the analysis of relevant research results both at home and abroad, this paper takes Nanyou Expressway connecting Nanning and Youyiguan as the research object, Data, and selected more than 40 representative sections in the South Friends of the high speed, field measured speed data. By analyzing the distribution characteristics of speed and line shape, a running speed prediction model reflecting the characteristics of two-way 4-lane expressway in mountainous area of Guangxi was established.