EFFICIENCY OF DUAL LEFT-TURN LANE INTERSECTIONS IN CHARLOTTE: A STUDY USING TRAF-NETSIM

Dual left-turn lanes were originally developed to ease congestion at intersections and to add capacity. In Charlotte, North Carolina, a study was initiated to estimate any improvement in overall efficiency of high-demand intersections due to the addition of dual left-turn lanes. Investigators defined dual left-turn efficiency in terms of overall intersection delay per vehicle compared with overall intersection delay per vehicle for the same intersections with single left turns. TRAF-NETSIM, a microscopic computer model that simulates individual vehicular behavior in response to common traffic situations, was the tool used to model traffic flow through one of the chosen intersections with and without the dual left-turn lanes. Investigators found that the decrease in delay ranged from 6 percent to 37 percent by using dual left-turn lanes in place of single left-turn lanes with proportionately more green time. Findings of the analyses reveal that the installation of dual left-turn lanes is favorable at intersections containing high volumes of left-turning traffic and opposing traffic.

  • Availability:
  • Corporate Authors:

    Institute of Transportation Engineers (ITE)

    Washington, DC  United States 
  • Authors:
    • Shaik, R A
    • Graham, J R
  • Publication Date: 1996-4

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00726943
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Oct 16 1996 12:00AM