• ISSN 0258-2724
  • CN 51-1277/U
  • EI Compendex
  • Scopus
  • Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
  • Chinese S&T Journal Citation Reports
  • Chinese Science Citation Database
Volume 27 Issue 1
Jan.  2014
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Article Contents
WU Yong, LIU Xinrong, LI Rui. Relationships between Crash Rate and Traffic Density at Urban Expressway Diverge Segments[J]. Journal of Southwest Jiaotong University, 2014, 27(1): 134-140. doi: 10.3969/j.issn.0258-2724.2014.01.021
Citation: WU Yong, LIU Xinrong, LI Rui. Relationships between Crash Rate and Traffic Density at Urban Expressway Diverge Segments[J]. Journal of Southwest Jiaotong University, 2014, 27(1): 134-140. doi: 10.3969/j.issn.0258-2724.2014.01.021

Relationships between Crash Rate and Traffic Density at Urban Expressway Diverge Segments

doi: 10.3969/j.issn.0258-2724.2014.01.021
  • Received Date: 09 Jun 2012
  • Publish Date: 25 Jan 2014
  • In order to seek safer methods of geometric design and traffic control strategies, the characteristics of crash rate (CR) varying with traffic flow conditions at diverge segments was studied based on Nagoya Urban Expressway network. Diverge segments were generally defined from 450 m upstream to 300 m downstream of ramp junctions. The relationships between CR and traffic flow density, as well as the tendencies of CR at diverge segments of different geometric features were analyzed. The results show that the CR in uncongested flow is convex downward to the traffic density. By contrast, the CR increases with the traffic density in congested flow and its value is much higher than in uncongested flow. In addition, in uncongested flow, multi-vehicle crash is the main crash mode and its RC is increasing with the traffic density. Compared to straight alignments, downstream sections of diverging area, and right-hand structures, significantly higher RC exist in curve alignments, upstream sections, and left-hand structures, respectively.

     

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