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Safety Assessment of Highway Alignment Based on Improved AHP-Fuzzy Comprehensive Evaluation

Author: ZhaoLong
Tutor: HeZhiYong
School: South China University of Technology
Course: Road and Railway Engineering
Keywords: highway safety improved AHP evaluation
CLC: U412.3
Type: Master's thesis
Year: 2011
Downloads: 84
Quote: 1
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Abstract

With further advance of socialist construction in China, the highway construction get a rapid development. Meanwhile, highway safety issues are becoming increasingly prominent. Alignment as the key component of highway project, is the most intuitive reaction of design quality. A safe, smooth and comfortable highway alignment for improving highway safety is of great significance. Therefore, it is necessary to establish a set of scientific and perfect highway alignment safety assessment model to evaluate highway project. The model can judge the defects of highway design and improve highway safety effectively. It is very meaningful for improving traffic safety situation in china.By analysing the elements that influence highway safety, such as plane, vertical, cross section, sight distance, installations along the alignment, operating speed, the paper reforms and confirms a new index system. The index system include alignment related index, installations related index, speed related index. Each index evaluation standards and scoring rules was given. Then based on the drawback of traditional AHP method in the scale of 1 ~ 9, puts forward a new scale, namely the scale of ln9( 9 e)～ln( 1 17 e). After the comparative analysis, this scale is better than other scales on the follow standards: perceptibility of scale, uniformity of scale, original order’s keeping, fit of scale-weight, consistency of judgment. The article puts forward an improved AHP method for weight assignment based on the new scale. Then establish a set of highway alignment safety comprehensive assessment model combining the fuzzy comprehensive evaluation theory, and give evaluation process and procedure. Realize the goal that make a quantitative evaluation for the highway alignment safety. At last, using the research achievement evaluate the safety of a highway project. The evaluate result proves the rationality and feasibility of evaluation system.This paper discusses the method of safety assessment of highway alignment. This evaluation method can be used not only in the inspection of highway design phase and in the selection of alignment schemes, but also in the evaluation of the completed highway safety, so that the problems of highway alignment can be founded and be solved.

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