Study on Capacity for Exclusive Triple Left-Turn Lanes with Outside Trap Lane at Signalized Intersections

Based on the survey data of three signalized intersections with exclusive triple left-turn lane and with outside trap lane in Beijing, traffic flow characteristics of left-turns are studied by using statistical methods. It shows that the discharge headway and saturation flow rate of exclusive triple left-turn lane with outside trap lane divides into two stages when the discharge time of vehicles in the left-turn bay is less than the left-turn green time. This problem is uncharted in the Highway Capacity Manual (HCM). This research analyzes the effects of relationship between the length of left-turn bay and green time on the left-turn capacity. A theoretic model for left-turn capacity is developed by considering this characteristic. The developed capacity model will be validated on the basis of VISSIM simulations of a real-world signalized intersection. And the results demonstrate that the proposed capacity models well estimate the left-turn capacity at signalized intersections in the case, which the length of left-turn bay and green time is not well optimized and well reflect the capacity loss due to the transitional area bottleneck.

• Record URL:
  https://doi.org/10.1061/9780784412442.046
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9780784412442
• Supplemental Notes:
  • © 2012 American Society of Civil Engineers.
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Zong, Erkai
  • Shao, Changqiao
  • Yang, Chao
  • Bai, Miao
  • Liu, Liqin
• Conference:
  • Twelfth COTA International Conference of Transportation Professionals
  • Location: Beijing , China
  • Date: 2012-8-3 to 2012-8-6
• Publication Date: 2012-8

Language

• English

Media Info

• Media Type: Web
• Features: Figures; References; Tables;
• Pagination: pp 434-447
• Monograph Title: CICTP 2012: Multimodal Transportation Systems—Convenient, Safe, Cost-Effective, Efficient

Subject/Index Terms

• TRT Terms: Highway capacity; Left turn lanes; Left turns; Signalized intersections; Simulation; Traffic flow; Traffic signal cycle
• Geographic Terms: Beijing (China)
• Subject Areas: Highways; Operations and Traffic Management; I73: Traffic Control;

Filing Info

• Accession Number: 01500135
• Record Type: Publication
• ISBN: 9780784412442
• Files: TRIS, ASCE
• Created Date: Nov 12 2013 2:34PM