二级公路在中国公路网中占有重要地位,一般采用双向两车道布局.然而,当交通流量达到一定水平时,二级公路的双车道布局模式很难满足车辆在行驶过程中的超车需求."2+1"车道布局为上述问题提供了很好的解决方案,但如何确定最佳超车段长度已成为一个新问题.以"2+1"车道二级公路为研究对象,通过采用微观交通仿真技术,以延误和速度为评价指标,针对不同的流量和车型组合对超车段长度开展了仿真分析和评价,结果表明:在"2+1"车道布局模式下,超车段的通行效率有显著提高,超车段的最佳长度为1.2 km.
Length Setting and Simulation of"2+1"Lanes Overtaking Section for Second-Class Highway
Second-class highway occupuies an important position in China's highway network,which generally adopts a two-lanes layout in both directions.However,when the traffic flow reaches a certain level,the two-lanes layout mode of second-class highway is difficult to meet the overtaking demand of vehicles in the driving process.The"2+1"lanes layout provides a good solution to the above problems,but how to determine the optimal overtak-ing section length has become a new problem.This paper takes the"2+1"lanes second-class highway as the re-search object,by using microscopic traffic simulation technology and taking delay and velocity as the evaluation in-dices,simulation analysis and evaluation are carried out on the length of overtaking section for different flow and ve-hicle type combinations.The results show:Under the"2+1"lanes layout mode,the traffic efficiency of overtaking section has been significantly improved,and the optimal length of overtaking section is 1.2 km.
"2+1"lanesSecond-class highwayLength of overtaking sectionTraffic simulation
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