Comparing Roundabout Capacity Analysis Methods, or How the Selection of Analysis Method Can Affect the Design

Several analysis methods have been proposed to analyze the vehicular capacity of roundabouts. Some are deterministic equations based on regression equations of observed capacity or observed gap acceptance. Others are stochastic models that simulate driver behavior. Some are equations that can be applied manually or using spreadsheets. Others require computer software to implement. Given these differences, it may not be apparent which method is the best to use for a particular case. When comparing capacity analysis methods, it would be useful to know how the various methods perform over a range of approach and conflicting volumes. This paper reports on the approach capacity for a single-lane roundabout based on the maximum entering and conflicting circulating volumes for several analysis methods. In Roundabouts: An Informational Guide (Federal Highway Administration, 2000), Figure 4-3 shows a capacity chart according to the recommended capacity equations. Similar capacity charts were prepared for six additional methods: HCM (Highway Capacity Manual) 2000, HCM 2010, SIDRA INTERSECTION, SimTraffic, VISSIM, and Paramics.


  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: pp 1-15
  • Monograph Title: ITE 2012 Annual Meeting & Exhibit

Subject/Index Terms

Filing Info

  • Accession Number: 01495108
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 26 2013 1:55AM