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引言密度是交通流十分重要参数之一,也是判别交通流状态的一个重要指标。在道路通行能力评价中,密度是道路服务水平分级的重要指标。由于道路结构的差异性,仅通过交通量等参数难以全面描述交通流的实际状态。例如交通量趋近于零,既可以是描述车辆很少时的道路交通,也可以表示交通严重拥挤,车流处于停滞状态。而交通流密度可以直接判定拥挤程度,从而决定采用何种交通管理和控制措施。
INTRODUCTION Density is one of the most important parameters of traffic flow and also an important indicator of traffic flow status. In the assessment of road capacity, density is an important indicator of the level of road service. Due to the differences in road structure, it is difficult to fully describe the actual state of traffic flow only through parameters such as traffic volume. For example, the amount of traffic approaching zero can be either a description of road traffic when there are few vehicles or a serious congestion of traffic and a stagnant traffic flow. The traffic flow density can be directly determine the degree of congestion, in order to decide what kind of traffic management and control measures.