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该文研究了全美范围内采用灵活性设计的道路工程,包括从乡村到城市的过渡路段与在原乡村道路的基础上修建的城市道路,结果发现,在所研究的22个工程(案例)中,小范围路段上的灵活性设计对道路安全性的影响不大。收集了每个工程多年的撞车事故数据,并检查了每个事故地点(采用事故前后对比分析法与专家组分析法),以评价采用灵活性设计后可能产生的安全影响。在事故数据与案例分析的基础上,可以清楚地看到,设计所采用的指标值不超过《绿皮书》所规定的范围(或是采用根据设计目标调整的略超范围的指标值),均可保证一定的安全水平。
This paper examines the nationwide flexible design of road projects, including the transition from rural to urban areas and the urban roads built on the original rural roads, and found that of the 22 projects (cases) studied, Flexibility design on small sections has little effect on road safety. The crash data collected for many years for each project were collected and examined at each accident location (using comparative analysis before and after the accident with expert panel analysis) to assess the possible safety implications of adopting a flexible design. Based on the accident data and case studies, it is clear that the values used in the design do not exceed the Green Paper’s (or slightly over-adjusted target values based on design goals) Can guarantee a certain level of safety.