Traffic Congestion Mechanism in Two Ramp Systems |
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Authors: | ZHAO Xiao-Mei SONG Gui-Cui SONG Yu-Kun |
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Institution: | 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 |
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Abstract: | The aim of this paper is to study traffic properties in an on/off-ramp system with a bus stop close to the on/off ramp. The location of the bus stop in the on/off-ramp (thereafter downstream or upstream case) is discussed. The simulation results show that in the two ramp systems, the reasons for traffic congestions are different. In the on-ramp system, buses and cars coming from on-ramp interweave each other, while in the off-ramp system, busesinterweave with cars exiting to off-ramp. Thus, in the on-ramp (off-ramp) system, the upstream (downstream) bus stop is helpful to reduce the interweaving situation. Moreover, the negative effect will disappear when the distance between the bus stop and the on/off-ramp is more than 20 cells (i.e. 150 m). These qualitative findings may provide some suggestions on traffic management and optimization. |
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Keywords: | cellular automaton model traffic congestion traffic bottleneck ramp system |
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