Exploring the Characteristics of Hysteresis Phenomena of Macroscopic Fundamental Diagram for Urban Expressway Network: the Case of Shanghai

This paper investigates the existence and the characteristics of macroscopic fundamental diagram in the urban expressway network in metropolis, by analyzing real data in Shanghai, China. In this paper, the existence of the hysteresis phenomena is examined under different traffic situations. Based on the comprehensive analysis, we verified the relationship between hysteresis phenomena and the inhomogeneity of traffic distribution. Furthermore, we defined two parameters to analyze the hysteresis phenomena: the high and low occupancy indices. Another major contribution of this paper is that we introduce the index of congestion to analyze the length of the hysteresis loop (∆O) and the drop of network flow (∆Q). The direct relationship between the length of the hysteresis loop (∆O) and the congestion is proved. The drop of network flow (∆Q) due to the hysteresis phenomena is relatively constant, about 13 veh/5min/lane.

• Supplemental Notes:
  • This paper was sponsored by TRB committee AHB45 Traffic Flow Theory and Characteristics.
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Shi, Xinyi
  • Hangfei, Lin
• Conference:
  • Transportation Research Board 93rd Annual Meeting
  • Location: Washington DC
  • Date: 2014-1-12 to 2014-1-16
• Date: 2014

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: 16p
• Monograph Title: TRB 93rd Annual Meeting Compendium of Papers

Subject/Index Terms

• TRT Terms: Adaptive control; Expressways; Hysteresis; Macroscopic traffic flow; Network analysis (Planning)
• Uncontrolled Terms: Fundamental diagram; Road networks
• Geographic Terms: Shanghai (China)
• Subject Areas: Data and Information Technology; Highways; Operations and Traffic Management; I71: Traffic Theory; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 01517532
• Record Type: Publication
• Report/Paper Numbers: 14-2060
• Files: TRIS, TRB, ATRI
• Created Date: Mar 10 2014 9:23AM