| Due to the constraints of geology,terrain,environmental protection,engineering cost and other factors,mountainous double-lane highways often have more longitudinal sections,which have a huge impact on the traffic efficiency and traffic safety of the highway.To overcome this problem,One solution is to set up a climbing lane.Guizhou,Shaanxi and other provinces of our country have carried out extensive application practice and research on climbing lanes successively.While accumulating construction experience,they also exposed the question of whether the operating status of the road section has been effectively improved,and lack of effective evaluation methods.In order to improve the application effect of hill climbing lanes,it is necessary to carry out a study on improving the traffic flow operation status of hill climbing lanes.This article has carried out extensive research on the basis of fully studying the existing relevant norms,literature,cases and other materials.The main research work is as follows:First,a comparative analysis of the setting conditions,operating conditions before and after the setting of the climbing lanes at home and abroad was carried out,and the influencing factors of the allocation of right of way,the change of operating speed,and the behavior of following the lane change behavior of the section where the climbing lane was located were analyzed.The measured data determines the leading vehicle model for the subsequent simulation experiments.Secondly,the simulation software parameters were calibrated according to the traffic flow characteristics of the two-lane highway in the mountain area.The corrected simulation experiment model was used to analyze the front and rear of the climbing lane setting from the aspects of capacity,average speed of the road section,operating delay,speed standard deviation,etc.The influence of various parameters on the running state of the climbing direction of the longitudinal section,the results show that: the mixing ratio of large vehicles is the main factor that determines the reduction of the operating delay;the traffic volume and the mixing ratio of large vehicles are the main factors that affect the improvement of the capacity of the road section of the climbing vehicle : A 300-meter climbing lane is added to the longitudinal section of a two-lane highway with a slope length of 900 meters and a slope of 3%.The average speed of small passenger cars is increased by 10% to 16%,and the average speed of trucks is increased by 5% to 13%.The capacity improvement rate is 3%～26%,and the operating delay time reduction rate is up to more than 90%.Then,in order to evaluate the improvement effect of the climbing lane setting on the running state of the longitudinal section,this paper combines the simulation experiment and the traffic flow theory to select the running state of the longitudinal section of the two-lane highway in the mountain area from the aspects of traffic flow service efficiency,safety,and stability Evaluation index system;on the basis of the traditional entropy weight-TOPSIS comprehensive evaluation method,the evaluation weight calculation process is improved by using the mean square error objective weight method,and a comprehensive evaluation model based on mean square error-TOPSIS for the operation status of the longitudinal section of the two-lane highway in the mountain area is established,And tested it.Finally,the evaluation model was applied to the project of climbing roads in the K105+210 section of Dejiang County,G326,and the improvement effect of the climbing road on the traffic flow of the road section was evaluated,and the improvement of the running state of the setting of the climbing road was given.Methods and measures apply theory to guide engineering practice.The research in this paper can provide a certain technical reference for the evaluation of the improvement effect of the running state of the climbing road section of the twolane highway in mountainous areas. |
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