The heat fade of fully loaded trucks while braking will readily occur on long downgrade route sections of mountainous highways due to speed-control and continuous braking. If the brake fails, it will lead to serious traffic accidents.In this article, the brake temperature variation process of fully loaded medium trucks was simulated through the bench tests. First, two kinds of single forecasting models were established based on experimental data and regression analysis, and the combination forecasting model of the braking risk of fully loaded medium trucks on the long downgrade route sections was established based on the entropy weight method. At the same time, the regularities of drum brake temperature variations under different initial speeds were analyzed, and the critical temperature value and the maximum critical braking times of the brake failure corresponding to different initial braking speed were obtained. The results show that the higher the initial braking speed is, the higher the failure temperature of the brake; however, the lower the maximum critical braking times of the brake failure are, which shows that the higher the initial braking speed is, the easier it is to reach the failure state. The risk combination forecasting model is more reliable and scientific.
This paper is intended to provide valuable references and experiences for the road traffic management department and the sector which formulate the traffic regulations and standards. Based on analysis of the relevant research domestic and overseas, this paper uses the quantitative argumentation mainly and the qualitative analysis as a supplement. It puts forward some concepts about information quantity transferred from highway traffic engineering facilities, mutual information and information entropy. According to the basic elements of traffic engineering facilities, it also builds a basic amount of information computational model which serves for the highway traffic engineering facilities from the angle of the eight types of information (Chinese character information, English character information, Arabic numerals information, Geometric shapes information ,Color information ,Guidance information , Graph or characteristic symbol information and linear facilities information ,et al .Minority characters is not considered temporarily here.). Besides, to analyze the theoretical information content which can be obtained by drivers in the unit road space, this paper proposes a concept called transmission information density of highway traffic engineering facilities and does a case analysis for the component model. The research in this paper has a certain theoretical significance and practical value for improving the service capacity, operational efficiency and safety level of the highway traffic system.
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