双向道路“分隔带调头口”排队模型化

Queuing Model for U-Turn Mouth of Bi-directional Streets

在以往的道路分隔带调头口的设计中,多是采用经验做法,这不免存在缺陷。为了弥补这一缺陷,必须对调头口进行量化研究,用数学知识来描述调头口。排队模型就是个很好的工具,把调头口模型化,从理论上对调头口的排队性质与排队参数进行论述。基于排队模型的性质,系统的到达率与服务率是进行排队研究的基础。在调头口排队系统中,主要利用概率知识从理论上进行推导。在调头口排队理论基础上,通过实际交通调查即可确定调头口的设计长度,也可决定调头口是否应该采取交通管制。

Because the empirical design approach is applied to the former design of U-turn mouth, there are always some inevitable blemishes. In order to make up with these blemishes, mathematical knowledge should be used to describe the U-turn mouth. Queuing model is a good tool to modelize the U-turn mouth ,which theoretically elaborates the nature of queuing model and queuing parameters. Based on the nature of queuing model, the arrival rate and dissipation rate are the cores of queuing study. In U-turn system, probability theory is mainly used to deduce theoretically. On the theoretical basis, the length of U-turn mouth can be determined through the actual traffic survey, and whether the traffic control should be taken for U-turn mouth can also be determined.