Traffic Safety Assessment of High-grade Highway Based on Uncertainty Measurement Theory

Abstract:

Based on the uncertainty measurement theory,a safe grade-assessment and order-arrangement model of high-grade highway was established.First,the main factors influencing the safety of high-grade highway were taken into account to construct evaluation index system and appraisal criterion,and then uncertainty measurement functions for the main indexes were achieved according to the field data.Information Entropy theory was adopted to calculate the weight coefficients of these influencing factors,and then safe assessment grade was determined by credible degree recognition criteria.Finally,the results of safety evaluation for high-grade highway were obtained.The evaluation method can not only solve many uncertainty problems affected by various factors in highway safe aspect,but also can rank the order of safe degree.This method was adopted to evaluate safety level of four high-grade highways in Xinjiang Uygur Autonomous Region of China.Compared with the results of fuzzy synthetic evaluation method,the study results show that uncertainty measurement method is reasonable and can be applied to the actual engineering.

Key words:uncertainty measurement; high-grade highway; traffic engineering; safety evaluation; credible degree recognition criterion; entropy