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基于时间安全余量的跟驰模型

, PP. 90-93

Keywords: 交通工程,跟驰模型,微观仿真,安全余量,CA模型,交通流量

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Abstract:

为了能够找到CA跟驰模型无法对道路的通行能力进行准确分析的原因,并对之进行改进,分别从时间安全余量和空间安全余量的角度对CA跟驰模型进行了分析。结果表明由于传统CA模型的跟驰间距是在临界跟驰间距的基础上添加一个空间安全余量,因此在车辆低速时,CA模型推出的跟驰间距会大于现实数据,而在车辆高速时,CA模型推出的跟驰间距又会小于现实数据,从而导致CA模型在分析交通通行能力时不准确;而将模型的安全余量加在时间上,则可以在车辆中、低速条件下有效地克服传统CA模型的不足之处,其仿真数据与实地采集的数据,在车流速度不超过60km/h时有较好的吻合度。

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