Operational and Emission Analyses of Roundabouts under Varied Vehicle and Pedestrian Demands

Roundabouts are becoming more and more common as an alternative to signalized intersections in many states across the U.S., including New England. Despite their increased popularity and the extensive literature on the operational, safety, and environmental aspects of roundabouts, there is no consensus on the conditions under which roundabouts should be replacing signalized intersections. The goal of the proposed research is to conduct a comparative evaluation of the impact of vehicle and pedestrian demand on the operational and environmental performance at roundabouts and signalized intersections. This will be feasible with field tests that will provide second-by-second trajectory data to be used along with existing emission models for the estimation of overall emissions as functions of pedestrian and vehicle demand and turning ratios. This information will also be utilized to perform simulation tests for varying pedestrian and vehicle demands that will allow for a more comprehensive comparison of capacity and emissions at roundabouts versus signalized intersections. Ultimately, this research will provide guidance for implementing roundabouts versus signalized intersections based on certain measures of effectiveness such as capacity and air pollutant emissions while accounting for the presence of pedestrians. It will also allow for calibration of microsimulation models that can then be used more extensively for evaluating the performance of other roundabouts in the region without the need for expensive and time-consuming field studies.

  • Record URL:
  • Supplemental Notes:
    • Contract to a Performing Organization has not yet been awarded.


  • English


  • Status: Active
  • Funding: $249500.00
  • Contract Numbers:



  • Sponsor Organizations:

    Research and Innovative Technology Administration

    University Transportation Centers Program
    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Start Date: 20131001
  • Expected Completion Date: 0
  • Actual Completion Date: 20180930
  • Source Data: RiP Project 39332

Subject/Index Terms

Filing Info

  • Accession Number: 01557733
  • Record Type: Research project
  • Source Agency: New England University Transportation Center
  • Contract Numbers: DTRT13-G-UTC31, UMAR25-24
  • Files: UTC, RiP
  • Created Date: Mar 25 2015 1:00AM