中国物理B ›› 2009, Vol. 18 ›› Issue (12): 5242-5248.doi: 10.1088/1674-1056/18/12/022

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Combined bottleneck effect of on-ramp and bus stop in a cellular automaton model

宋玉鲲, 赵小梅   

  1. School of Traffic and Transportation, Beijing Jiaotong University, Beijing 100044, China; MOE Key Laboratory for Urban Transportation Complex Systems Theory and Technology, Beijing Jiaotong University, Beijing 100044, China
  • 收稿日期:2009-04-11 修回日期:2009-05-07 出版日期:2009-12-20 发布日期:2009-12-20
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant No 2006CB705500), and the National Natural Science Foundation of China (Grant Nos 70631001, 70701004 and 70501004).

Combined bottleneck effect of on-ramp and bus stop in a cellular automaton model

Song Yu-Kun(宋玉鲲) and Zhao Xiao-Mei(赵小梅)†   

  1. School of Traffic and Transportation, Beijing Jiaotong University, Beijing 100044, China; MOE Key Laboratory for Urban Transportation Complex Systems Theory and Technology, Beijing Jiaotong University, Beijing 100044, China
  • Received:2009-04-11 Revised:2009-05-07 Online:2009-12-20 Published:2009-12-20
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant No 2006CB705500), and the National Natural Science Foundation of China (Grant Nos 70631001, 70701004 and 70501004).

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摘要： The combined bottleneck effect is investigated by modeling traffic systems with an on-ramp and a nearby bus stop in a two-lane cellular automaton model. Two cases, i.e. the bus stop locates in the downstream section of the on-ramp and the bus stop locates in the upstream section of the on-ramp, are considered separately. The upstream flux and downstream flux of the main road, as well as the on-ramp flux are analysed in detail, with respect to the entering probabilities and the distance between the on-ramp and the bus stop. It is found that the combination of the two bottlenecks causes the capacity to drop off, because the vehicles entering the main road from the on-ramp would interweave with the stopping (pulling-out) buses in the downstream (upstream) case. The traffic conflict in the former case is much heavier than that in the latter, causing the downstream main road to be utilized inefficiently. This suggests that the bus stop should be set in the upstream section of the on-ramp to enhance the capacity. The fluxes both on the main road and on the on-ramp vary with the distance between the two bottlenecks in both cases. However, the effects of distance disappear gradually at large distances. These findings might give some guidance to traffic optimization and management.

Abstract: The combined bottleneck effect is investigated by modeling traffic systems with an on-ramp and a nearby bus stop in a two-lane cellular automaton model. Two cases, i.e. the bus stop locates in the downstream section of the on-ramp and the bus stop locates in the upstream section of the on-ramp, are considered separately. The upstream flux and downstream flux of the main road, as well as the on-ramp flux are analysed in detail, with respect to the entering probabilities and the distance between the on-ramp and the bus stop. It is found that the combination of the two bottlenecks causes the capacity to drop off, because the vehicles entering the main road from the on-ramp would interweave with the stopping (pulling-out) buses in the downstream (upstream) case. The traffic conflict in the former case is much heavier than that in the latter, causing the downstream main road to be utilized inefficiently. This suggests that the bus stop should be set in the upstream section of the on-ramp to enhance the capacity. The fluxes both on the main road and on the on-ramp vary with the distance between the two bottlenecks in both cases. However, the effects of distance disappear gradually at large distances. These findings might give some guidance to traffic optimization and management.

Key words: cellular automaton model, combined bottleneck, bus stop, on-ramp

中图分类号:  (Granular models of complex systems; traffic flow)

  • 45.70.Vn
02.50.Cw (Probability theory) 89.40.Bb (Land transportation)