Research Of Highway Alignment Quality Of Design Evaluation Methods

The road alignment design should be continuum, the index to be continuously balanced linear, causing the automobile to run safely and comfortably. It is the road alignment design that has an important effect for the operating results,however,when people worked in practice,they often ignored or simplified the process of the testing for the linear design and evaluation of the quality, with a strong subjective,or confined to the limited provisions of the norms.It has the great theoretical and practical significance how to carry out the quentitative evaluation of the quality of linear conveniently and fast for improve the quality of the highway design:Firstly,based on Design Specification for Highway Route, this article evaluates the designed road alignment and corrects the unreasonable index value through fixing on the theory scope of alignment index value to reduce the unsafe factors and enhance the quality of design.Secondly, this article puts forward the main alignment index, and applies the fuzzing mathematics judgment method to evaluate the safety of road alignment, in which applies the improved Deuel Philippines method to obtain the appraisal matrix, the analytic hierarchy process to obtain the weight, through the method of grading to appraise the situation of the road design quality. Meanwhile, the method of grey relation degree is used to evaluate the compatibility among the indexes in order to assess whether the road alignment design is well or not . Contrasting the two methods, the results is obtained that the former with certain subjectivity has great computation load, and the latter is small and applied widely.Finally, for the key indicator linear design - the design speed,to establish of the evaluation model of speed. To calculate the speed of the different sections through the model, accessing the larger different section between speed and Design speed,so as to guarantee and improve the car's safety and comfort.As the project application, in order to obtain the good level of combining with the practice alignment material of project instance Dan - Ben highway, testing and evaluating the indicators of linear design with the three above mentioneds respectively, simultaneously proposes the improvement plan to the unreasonable design.