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Mathematical Problems in Engineering
Volume 2013, Article ID 254841, 7 pages
Research Article

Empirical Analysis of Traffic Bottleneck at Beijing Expressways

College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China

Received 23 July 2013; Revised 16 September 2013; Accepted 16 September 2013

Academic Editor: Wuhong Wang

Copyright © 2013 Sheng Jin et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The expressways in Beijing are confronted with more serious traffic congestions. Based on the survey data obtained from the typical sections at the expressways, the time dependent characteristics of traffic flow parameters were analyzed in detail and the data gap was found in this paper. The Fast Fourier Transform (FFT) method is proposed to transfer the data of traffic flow parameters for describing the fluctuation characteristics of traffic flow. Two methods of identification, the graph method and the control line method, were proposed as to the change time of traffic bottleneck forming and dissipating. The findings in this paper have already been applied in traffic management and ramp control at the expressways in Beijing.