Study Of Traffic Organization And Safety Safeguard Technique For Freeway Reconstruction And Extension Work Zones

Degree of perfection of transportation infrastructure is connected with the developmentof the national economy. In recent years, Chinese Investment in infrastructure construction isbecoming larger,highway mileage is increasing constantly.But after the road is built,supporting facilities is increasing more quikly,as the passage of service time,the earlierhighway can’t correspond with the increasingly traffic demand,many highway’s volume oftraffic exceeds the design traffic capacity, service level is declining constantly,leading to thehighway traffic jams directly,in addition, the earlier highway’s subgrade and pavement isbroken badly,influencing driving comfort and security,these changes hide potential safetyhazards,leading to the traffic accidents.Therefore,a large number of highway need upgrading，transforming or expansion. Currently,reconstruetion and extension of expressways havebecome a hot spot in China’s expressway construction, it’s important that how to divert thetraffic flow in time during the renovation and expansion. Therefore, study of the trafficorganization program has an important significance.The paper mainly regardsShenzhen,shantou west-middle section of highway as the case for highway constructionoperation area of traffic organization and the safety research.Based on the analysis of relevant research results,firstly,analysising the scheme ofreconstruetion and extension of expressways,determining the methods of investigating andanalysising transportation infrastructure data,investigating the traffic flow ofShenzhen,shantou west-middle section of highway and analysising the operating charactristicsof it meticulously;Then,analysising the traffic accident characteristics of operationarea,dicussing the factor of taffic accidents,the factor is divided into subjective factor andobjective factor,the basis is the traffic accident dataof the operation area,studying the various didribution regulation(time,space,cause,form)of the operation area’s traffic accidents, Multiple accident location identification methods isidentified by Cumulative frequency method,at the same time,in Shenzhen,shantouwest-middle section of highway, treatment measures is put forward.Studying on the traffic organization design of the expressway work zone, according todifferent traffic organization schemes, we have made a discussion on the characteristics of thetraffic organization schemes, combined with the influential factors, from different aspectssuch as construction mode, construction projects, level and the gradation of the structure, wearise different schemes and method of traffic organization. The key point is:”separating the traffic in the far-end, and controlling in the mid-sections, as to the traffic flow nearby, paymore attention to the supervision.” At last, decide the traffic organization scheme based on thehighway expansion.Based on the software named VISSIM, we established a model of road network, androad simulation model was established, too. The method to establish a model on the trafficorganization during the expansion of the expressway is put forward. from the model, the keyvalue of the traffic organization is obtained, combined with the traffic flow value of theproject, test and verify the schemes, after trial and error, we get the final road simulationmodel of traffic organization in the work zone of west Shen-Shan expressway.Setting methods of highway operation area safety sign are discussed,settingdiscipline,methods and requirements of markline, guardrail and safety device are alsodiscussed in detail;Putting forward specific speed limit schemes by studying Speed controltechnology;Recognition experiments of traffic sign are mainly performed,analysising thedegree of color and sign content of warning sign and speed limit sign,telling the differencebetween the recognition character of designing traffic sign and the experiment results of thepresent signs,the conclusion that traffic sign color and content need optimal design isdrawn,meanwhile,recommendation of the sign of Construction operation area is putfoeward.Finally,emergency plan theory of reconstruetion and extension of construction area isdetermined.This thesis research results provide new ideas and methods for the diverting schemes oftraffic flow of reconstruetion and extension of expressways,which is of vital value to thediverting of traffic flow of reconstruetion and extension area.