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中文摘要：
选取典型山区高速公路连续长下坡路段作为研究对象,系统分析山区高速公路连续长下坡路段运行速度特征。采集长下坡路段特征断面分车型、分车道运行速度数据,以85%位运行速度作为断面车速代表,利用数理统计方法,在车辆运行速度特征统计的基础上,进一步研究了连续长下坡路段大货车和小客车运行车速与平纵组合设计指标的定量关系,以分析设计指标对运行速度的影响。
英文摘要：
Taking the long str characteristics of its running speed the running speed data of different representative speed in the section, aight highway downgrades in mountainous area as is analyzed systematically. A typical road section is vehicle types on different lanes. 85% of running sp the statistical characteristics of the vehicle speed is study object, the selected to collect eed is taken as the obtained based on mathematical statistics. Furthermore, the correlations between the design of horizontal and vertical alignments and the running speed of coach and car is studied, from which the impact of the designing indexes for long straight highway downgrade on its speed of service is evaluated.
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