Study On An Intelligent Traffic Meteorologically Monitoring And Warning System

As a new industry, IST is receiving ever-increasing attention at a national and an international level with rapid development of high ways and meteorological contribution should be by no means underestimated, serving as one of the fundamental elements for raising IST intelligent performance.This paper aims at the requirements of the high-way ITS development in our country and traffic safety management, proposing a framework for the Intelligent Traffic Meteorological Monitoring and Warning System (ITMS) that is ITS-suitable and in urgent need for the management from market survey and ITS technical analysis. On the basis of study on monitoring and warning low visibility caused by heavy fog the research achieves fruits as follows.1) Starting from the definition of visibility and considering the working principles of a range of instruments as well as performance-price ratio the WT-1 forward scatter type is chosen as an information collector. Owing to the WT-1 over-saturation of signals over non-standard fields, an improvement is proposed for the cut-off of the light path by means of a screen according to the theory on atmospheric light transmission and directional reflection, thus effectively reducing requirements for non-standard fields.2) For ITS needs of real-time dynamic monitoring information an integrated traffic meteorological monitoring and warning network (ITMS), differing from conventional automatic stations in that 1) integrating collected information on traffic and meteorological factors into one system; 2) adopting an integrative mode of distributed intelligence units; 3) intensifying the processing function of extraordinary events in an intelligent manner, i.e., design of inner-environment temperature and electric pressure measuring and controlling, communications, collected conditions monitoring and warning function; design of warning of invaders; design of the function of warning and issuing dangerous weather.3) According to principles of fog formation the fog impacts of landforms and air pollution are analyzed, thereby revealing the causes of foggy weather over the hilly land in the west and stream net in the east, so that theoretical basis is offered for the choice of meteorological traffic monitoring stations and the selection of observational elements.4) Following the principles and distribution of the ITMS stations, part of the functions are selected for developing the local ITMS version for the piece in Jiangsu of the Shanghai-Nanjing High Way together with the criteria of station-position and weather element choice based on study of site and element selection as well as instrument installment.Experiment and demonstration of the ITMS show that the system has high stability, soundness and operability that provide good technical support for graded forecasts of heavy fog-visibility and the realized intelligent warning is conducive to raising ITS decision-making ability in advance. Main results are summarized as follows.1) For removing WT-1 signal over-saturation in an atypical field a new method is proposed for the light path to be screened.2) The proposed ITMS is based a MiNi network.3) Criteria are suggested for selecting site-position, weather elements and guideline of equipment installment.4) Developed is the sub-ITMS suitable for the Jiangsu piece of the Shanghai-Nanjing High Way and it is proved to be effective through experiment and application.