基 于 改 进 系 统 工 程 决 策 理 论 的 高 速 公 路交 通 安 全 评 价 研 究

This paper aims to break through the limitation of“crash intensity analysis”in the conven⁃ tional single-dimension traffic safety evaluation and realize the quantitative evaluation of freeway traffic safety level considering regional type differences. First, this paper constructs a comprehensive traffic safety level evaluation system for multi-regional freeway units to be evaluated by taking four dimen- sions as benchmarks and considering a total of eight of these characteristic indicators. Furthermore, the decision theory of systems engineering is innovatively adopted to address the problem of traffic safety evaluation. The improved osculating value method based on entropy weight is used to evaluate traffic safety from the perspective of annual and quarterly divisions, respectively. And based on the Euclidean distance obtained from the solution, the osculating value is finally used to characterize the merits of the unit to be evaluated. The results show that the traffic safety level in the annual and quarterly perspective shows significant differences among regional types of freeways. In addition, since the conventional osculating value method treats the evaluation indexes as equal weight, the conventional model should be optimized and improved with weight assignment in order to avoid the result deviation. Osculating value method does not have to introduce subjective parameter variables, and its calculation result has high resolution. The method can show high resolution results without introducing subjective parameters, and can be used as an effective road traffic safety evaluation method.