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对于中国许多高人口密度的城市,以可达性为导向的交通规划方法尤为重要.然而,已有的可达性指标只考虑了空间阻隔的影响,忽略了交通运行中出行者的选择行为对可达性的作用.此外,在交通规划中使用交通需求组合模型,其选择行为是基于随机效用理论,从而克服了四步模型存在的选择行为和结果不一致的问题.基于同样的随机效用理论,提出了可达性指标.该指标与交通需求组合模型能有效结合,并反映出行者在不同选择层次上的行为(出行选择、目的地选择、方式选择和路径选择).通过简单的算例,分析了所提出的可达性指标的性质.
For many cities with high population density in China, accessibility-oriented traffic planning methods are particularly important, however, the existing reachability metrics only consider the impact of spatial barriers and neglect the choice of travelers in traffic operations In addition, the traffic demand combination model is used in traffic planning, and its selection behavior is based on stochastic utility theory, so as to overcome the inconsistency between the selection behavior and the result of the four-step model.According to the same stochastic utility theory, This paper proposes a reachability index which can be effectively combined with the traffic demand portfolio model and reflects the behavior of the travelers at different levels of selection (travel choice, destination choice, choice of ways and route choice) .Through a simple example, The nature of the proposed reachability indicator is analyzed.