Using VISSIM to Model Capacity of U-turns at Unsignalized Intersections with Non-traversable Median Cross Sections

In this study, a procedure was proposed to help transportation professionals model capacity of U-turns at unsignalized intersections with non-traversable median cross sections in VISSIM. Using data collected from 13 different locations, the input values for behavioral features of U-turning drivers, such as the priority rule, lane selection, and turning speed of U-turns were determined. A procedure was proposed to calibrate and validate the VISSIM simulation model. Simulation results of the calibrated VISSIM model were compared to field measured capacity, as well as the capacity estimated using gap acceptance model developed in our previous studies. The calibrated VISSIM simulation model yields a Mean Absolute Percent Error (MAPE) of 17% and 16.6% for 4-lane and 6-lane streets, respectively. The results show that VISSIM provides reasonable capacity estimates for U-turns at unsignalized intersections with raised median cross sections, after crucial parameters are properly defined and calibrated.


  • English

Media Info

  • Media Type: DVD
  • Features: Figures; References;
  • Pagination: 15p
  • Monograph Title: TRB 89th Annual Meeting Compendium of Papers DVD

Subject/Index Terms

Filing Info

  • Accession Number: 01152308
  • Record Type: Publication
  • Report/Paper Numbers: 10-3710
  • Files: TRIS, TRB
  • Created Date: Jan 25 2010 11:53AM