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Congestion and efficiency in complex traffic and transportation networks

Xiao Yao Zheng Jian-Feng

Congestion and efficiency in complex traffic and transportation networks

Xiao Yao, Zheng Jian-Feng
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  • PDF Downloads:  543
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Publishing process
  • Received Date:  20 April 2013
  • Accepted Date:  13 May 2013
  • Published Online:  05 September 2013

Congestion and efficiency in complex traffic and transportation networks

  • 1. School of Traffic and Transportation, Beijing Jiaotong University, Beijing 100044, China;
  • 2. MOE Key Laboratory for Urban Transportation Complex Systems Theory and Technology, Beijing Jiaotong University, Beijing 100044, China
Fund Project:  Project supported by the National Basic Research of China (Grant No. 2012CB725400), and the National Natural Science Foundation of China (Grant Nos. 71131001, 71222101).

Abstract: This paper investigates the congestion and efficiency in complex traffic and transportation networks. Effects of different distributions of capacity and origin-destination traffic demand on the degree of congestion and efficiency are explored in different network topologies including scale-free networks, random networks and small-world networks. According to the increase of average traffic demand, the transition from free flow state to congested state is analyzed. For easy comparison, we discuss the reciprocal of the congestion degree, which is defined as the network unobstructedness. A linear relation between the degree of unobstructedness and efficiency in different networks is uncovered, and the linear proportional coefficients are different in scale-free networks, random networks and small-world networks. These coefficients can also be used to describe the different transport performance in different networks.

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