Research And Engineering Countermeasures Of The Speed Limit Of The Fog In The Pu-Xuan Highway

With the development of economy and society, the investment of fixed assets in the less developed areas of central and western regions of China is increasing rapidly. Yunnan Province, as the "bottom" of China’s transportation development, is facing a boom of highway construction. Yunnan Province in the northeast of the unique Yunnan Guizhou Plateau climate impact, mountain wind, rain, fog, etc. frequent meteorological disasters, seriously affecting the highway operation safety. Based on the Yunnan Guizhou Plateau in southwest Northeast Yunnan’s first opened to traffic on the highway, Xuan Pu highway construction project, in 2013 in Yunnan Province transportation hall of major scientific and technological project of the specific plateau climate and complex road conditions pale pinkish purple effect of freeway traffic safety technology research funding, to Pu Xuan Expressway fog day limit management as the research object, from fog on expressway traffic safety control speed index, expressway fog monitoring and early warning release technology development of fog on highway and countermeasures.Based on the study of the relevant research at home and abroad, this paper analyzes the applicable range of the common model of the speed limit of the car park, and puts forward that the model of the speed limit of the car park is only applicable to the first level service level. Our country highway requirements design and service level is not less than the third grade; the relevant provisions of China’s Ministry of Public Security Traffic Management Bureau, highway in visibility of less than 50 m should suspend service. So the research aimed at the three level and above service level of the service level of the expressway with the visibility of not less than 50 m. First to fog and visibility, dynamic visual acuity, road surface of the dynamic relationship between friction coefficient and stopping sight distance as the basis, according to the situation of the stopping sight distance speed model is proposed for a service level highway speed limit in fog area index; to speed deviation as the evaluation index, Pu Xuan century high speed traffic data modeling based on, by means of simulation comparison of different indicators to control the speed of the effectiveness of proposed second, tertiary service level under the condition of Pu Xuan Expressway fog area speed limit indicators. Distribution through the survey of general Xuan speed along the fog, sections according to the fog harm degree division of the ordinary section and fog Zone Road, and according to the division of section, combined with Xuan Pu speed design, mechanical and electrical design, proposed nepheloid zone road safety facilities optimization design of some suggestions. Research results help establish a foggy road weather information monitoring system and low visibility conditions traffic guidance system, the realization of foggy section alarm information and induced measures linkage released.