摘要
为了确定城市快速路菱形立交出入口交织区的合理长度,应用Vissim微观仿真模型,研究在不同流量组合及交织流量比情况下,菱形立交出入口区间平均速度与交织长度的关系。研究表明:交织区平均速度随交织长度的变化而变化。当交通量较小时,交织长度与区间平均速度的关系受交织流量比影响较小;当交通量较大时,交织流量比对交织长度与区间平均速度的关系影响较大;当交通量达到可能通行能力时,交织长度与区间平均速度的关系基本不受交织流量比影响。因此可得出,当交通量较小时,150 m的交织长度比较适宜;当交通量较大时,随交织流量比由0.25增大到0.45时,交织长度应由150 m增加到350 m,才能有较为理想的运行状态。
Micro-simulation software-VISSIM was utilized to analyze the reasonable distance of weaving section between exit and entrance pertaining to diamond interchange on the urban expressway, and the relationship between average speed and weaving length were studied in the case of different traffic flow combinations and different waving flow ratios. The results show that the weaving length has impact on the weaving flow ratio. The weaving flow ratio has a little influence on the weaving length when the traffic is small; the weaving flow ratio has an obvious influence on the weaving length when the traffic is biggish. The weaving flow ratio has no influence on the weaving length when the traffic reaches to possible traffic capacity. The outcome indicates that the reasonable distance should be 150m when the traffic is small; the reasonable distance should increase from 150m to 350m when the traffic is big. The perfect state will be achieved when the weaving flow ratio increases from 0. 25 to 0. 45.
出处
《交通与计算机》
2008年第4期92-94,180,共4页
Computer and Communications
关键词
交通工程
交织长度
交通仿真
城市菱形立交
出口
入口
traffic engineering
weaving length
traffic simulation
urban diamond interchange
exit
entrance
