Because fundamental mechanism is still unclear, especially the quantification method of road safe level has not been built yet, the research of this dissertation have certain meaning.
由于目前该体系的基本运作机理仍不清晰，更缺乏道路安全水平的量化方法，因此本论文的研究在理论及实践两方面都具有一定的意义。
Because fundamental mechanism is still unclear, especially the quantification method of road safe level has not been built yet, the research of this dissertation have certain meaning.
由于目前该体系的基本运作机理仍不清晰，更缺乏道路安全水平的量化方法，因此本论文的研究在理论及实践两方面都具有一定的意义。
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