Displaced Left-Turn Intersection: A Two-Stage Model and Application Insight

To improve intersection performance by reducing left-turn conflicts, the displaced left-turn (DLT) intersection, including the continuous flow intersection (CFI) and parallel flow intersection (PFI), could serve as an at-grade solution. This study proposes a two-stage model for the optimal design of DLT intersections. At Stage 1, a mixed integer linear program (MILP) is formulated to jointly determine the reserve capacity, lane configuration and green ratio. At Stage 2, based on the output of Stage 1, the authors propose a linear program to coordinate the signal plans between the main intersection and four sub-intersections created for left-turn traffic. Numerical experiments examine the effect of traffic demand and left-turn proportions on DLT while comparing DLT with conventional intersections. Results show that CFI outperforms conventional intersections and PFI in most cases. Little difference exists on vehicular delay between CFI and PFI under the small/medium demand input, while the difference becomes more prominent as left-turn traffic demand increases.

• Record URL:
  https://doi.org/10.1061/9780784482292.240
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9780784482292
• Supplemental Notes:
  • © 2019 American Society of Civil Engineers.
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Chu, Yuan
  • Li, Jing
  • Luo, Sida
  • Zeng, Luwei
• Conference:
  • 19th COTA International Conference of Transportation Professionals
  • Location: Nanjing , China
  • Date: 2019-7-6 to 2019-7-8
• Publication Date: 2019-7

Language

• English

Media Info

• Media Type: Web
• Monograph Title: CICTP 2019: Transportation in China—Connecting the World

Subject/Index Terms

• TRT Terms: Highway design; Left turn lanes; Left turn phase; Signalized intersections; Traffic conflicts; Traffic flow; Traffic signal timing
• Subject Areas: Design; Highways; Operations and Traffic Management;

Filing Info

• Accession Number: 01713630
• Record Type: Publication
• ISBN: 9780784482292
• Files: TRIS, ASCE
• Created Date: Aug 9 2019 5:00PM