General Roundabout Research

ARINIELLO, ALEX, J. “Are Roundabouts Good for Business?” LSC Transportation Consultants Inc., 2004.

BARANOWSKI, B. “Roundabout and Light Rail Combined: An Innovative Intermodal Solution.” National Roundabout Conference (Draft), Vail, Colorado, 2005.

CROWN, R.B., “Entryway Roundabout: Review of Operation and Safety” for the City of Clearwater. Rodel Software Ltd., 2001.

BARANOWSKI, B. “Pedestrian Crosswalk Signals at Roundabouts: Where are They Applicable?” National Roundabout Conference (Draft), Vail, Colorado, 2005.

BARANOWSKI, B.; WADDELL, E. “Alternative Design Methods for Pedestrian Safety at Roundabout Entries and Exits: Crash Studies and Design Practices in Australia, France, Great Britain and USA” Michigan Department of Transportation (DOT) 2003.

BARED, J.; Prosser, W.; Esse, C. “State-of-the-art design of roundabouts”. Transportation Research Record. (1579) pp 1-10. 1997.


“Evaluation of Four Recent Traffic and Safety Initiatives” Volume 1: Developing Guidelines for Roundabouts. Final Report, October 2005.

FLANNERY, A; ELEFTERIADOU, L. “A Review of Roundabout Safety Performance in the United States.” ITE International Conference, March 28 – 31, 1999.

FLORIDA DEPARTMENT OF TRANSPORTATION “Bicycle and Pedestrian Considerations at Roundabouts”, RTB, Subcommittee on Roundabouts, Summary of Final Report, WPI #0510824. Vail, Colorado, May 2005.

FORTUIJN, LAMBERTUS (G.H.). “Pedestrian and Bicycle-Friendly Roundabouts; Dilemma of Comfort and Safety”, Delft University of Technology, The Netherlands.

GRANA, A; GIUFFRE, T. “Performance Analysis of Roundabouts in Strongly Contained Environment; Case Studies in Urban Areas.” National Roundabout Conference (Draft), Vail, Colorado, 2005.

HÉTU, MARTIN “Roundabout Performance, Safety, Capacity and Signing”, TAC 2000.

HARPER, N., DUNN, R.“Preliminary Results for Accident Prediction at Urban Roundabouts in New Zealand”, ITE Seattle, 2003.

INMAN, V.W.; KATZ, B.J. “Navigation Signing for Roundabouts” National Roundabout Conference (Draft), Vail, Colorado, 2005.

INMAN, VAUGHAN. W. “Field Observations of Path and Speed of Motorists at Double-Lane Roundabouts,” Federal Highway Administration, 2002.

INSURANCE INSTITUTE FOR HIGHWAY SAFETY “A Review of Evidence-based Traffic Engineering Measures to Reduce Pedestrian-Motor Vehicle Crashes.” Original Submission August 1, 2003.

JACQUEMART, G.; OURSTON, L. “NCHRP Synthesis 264, Modern Roundabout Practice in the United States”. 1998. Leif Ourston contributed some forty hours of edits and additions to Mr. Jacquemart's document.

JOHNSON, M. “Hanson Road Overpass Alternatives Analysis” Wisconsin Department of Transportation. 2000.

JOHNSON, M.T. “Achieving Traffic and Transportation Solutions Through Excellence in Modern Roundabout Design.” MTJ Engineering, May 2005. This letter summarizes the capacity analysis and preliminary designs for the east and west sides of US23.

JOHNSON, M.T.; HANGE, W.A. “Modern Roundabout Intersections: When to Use Them?: A Comparison with Signalized Intersections.” 2002.

KARSTON, G.; BAASS; BRILON, W. “Roundabouts Providing an Excellent Service to the Road User.” 1995 Annual meeting of the Transportation Association of Canada.

KINZEL, C.S. “Signing and Pavement – Marking Strategies for Multi-Lane Roundabouts: An Informal Investigation”. Urban Street Symposium, July 2003.

KYTE, M.; DIXON, M.; LIST, G.; FLANNERY, A; RODEGERDTS, L. “NCRHP 2-65: Data Collection and Extraction.” National Roundabout Conference (Draft), Vail, Colorado, 2005.

LEAF, W.A.; Preusser, D. F. “Literature Review on Vehicle Travel Speeds and Pedestrian Injuries”, U.S. Department of Transportation, National Highway Traffic Safety Administration, October 1999.

In this report the relationship between vehicle travel speeds and resulting pedestrian injury was reviewed in the literature and in existing data sets.

LEE, J.C.; KIDD, B.D.; ROBENSON, B.; SCHRBROGH, W. “Roundabouts: An Arizona Case Study and Design Guideline Final Report 545” Arizona Department of Transportation, July 2003.

LENTERS, M.S. “Roundabout Planning and Design For Efficiency & Safety”. Annual Conference of The Transportation Association of Canada, St. John’s Newfoundland and Labrador. 2003.

LENTERS, M.S.  “Safety Auditing Roundabouts”. Annual Conference of the Transportation Association of Canada, Québec City, Québec. 2004.

LENTERS, M; KUHLOW, K. “Evaluation of Alternative Traffic Controls.” Department of Transportation of Wisconsin, June 2005. This report was prepared for D.O.T. of Wisconsin to evaluate alternative traffic controls for STH 28 (Washington Avenue) from County Trunk Highway ‘A’ to Greenwing Drive.

LENTERS, M; WEBER, P. “Roundabout Feasibility Study: Britton Parkway, City of Hilliard, Ohio.” December 2004.

LSC TRANSPORTATION CONSULTANTS “Existing Roundabouts at Mountain Resorts.” Town of Truckee, California, 2002.

LORD, D.; SCHALKWYK, I.V.; CHRYSLER, S.; STAPLIN, L. “A Strategy to Reduce Older Driver Injuries at Intersections Using More Accommodating Roundabout Design Practices.” Paper submitted for publication to accident analysis and prevention as a ‘short communication’. March 21, 2006.

MANDAVILLI, S; RUSSELL, E; RYS, M. “Environmental Impact of Kansas Roundabouts”. TAC Conference, Spring 2003.

MYERS, E. J. “Accident Reduction with Roundabouts”. ITE Annual Meeting Compendium, 1999.

This paper is an update to a paper the author co-wrote with Michael E. Niederhauser and Brian A. Collins for the 1997 Annual Meeting in Boston. The paper will update the accident statistics at the five initial sites where roundabouts have been installed by Maryland State Highway Administration.

NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM. NCHRP Synthesis 264: “Modern Roundabout Practice in the United States”. 1998.

NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM. Project 3-65: “Applying Roundabouts in the United States”, July 2004.

NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM. Project 3-65: “Review Summary of Models Relating Safety to Roundabout Characteristics”, July 2004.

NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM. Project 3-65: “Applying Roundabouts in the United States”, May 2006.

NORTH CAROLINA STATE UNIVERSITY. “The effects of roundabouts on pedestrian safety”. Raleigh, Department of Civil Engineering, Raleigh, NC, USA.  pp 50. August 2002. This research seeks to examine the safety issues by summarizing the literature that describes international and U.S. experience with roundabouts and pedestrian safety.  The research applies three alternate approaches to assess pedestrian safety at roundabouts: case study analysis, statistical analysis, and simulation analysis to compare pedestrian safety at a conventional signalized intersection to a case study modern roundabout. 

OH, H.; SISIOPIKU, V.P. “Probabilistic Models for Pedestrian Capacity and Delay at Roundabouts.” Transportation Research Circular, 2000.

OURSTON, L. "Roundabout Revolution Comes to America". Leif Ourston, WesternITE, November-December 1992.

OURSTON, L. "Roundabouts Increase Interchange Capacity". ITE Journal, December 1997. Greg Hall of Vail also authored this article.

OURSTON, L. "America's First Modern Roundabout Interchange". Leif Ourston, Presented to the 66th annual meeting of ITE in Denver, CO. August 1995.

OURSTON, L. "British Interchanges, Intersections, and Traffic Control Devices". Leif Ourston, WesternITE, 1987.

OURSTON, L. "British-style Roundabout or American-style Traffic Circle". WesternITE, December 1987.

OURSTON, L. "Nonconforming Traffic Circle Becomes Modern Roundabout". Presented to ITE 64th annual meeting, in Dallas, TX, October 1994.

OURSTON, L. “Wide Nodes and Narrow Roads". Paper presented to the Transportation Research Board, 72nd annual meeting in Washington, DC, January 1993.

OURSTON, L. "Where to Build Roundabouts". Presented to an International Meeting on Roundabouts, ITE, Loveland, CO, October 1998.

OURSTON, L. “Roundabout Design Guidelines”. Ourston Roundabout Engineering, 2001.

OURSTON, L. “Roundabouts: An Informational Guide”. FHWA-RD-00-067, June 2000. Mr. Ourston contributed his expertise as a technical editor of this document.

OURSTON, L.; BARED, J.G. "Roundabouts: A Direct Way to Highway Safety". Public Roads, Autumn 1995. Co-authored with Joe G. Bared of the Federal Highway Administration. This was a synthesis, and its original title when submitted in May of 1995 was "Synthesis of Recent Research on Highway Safety".

OURSTON, L.; BURNSIDE, J.  "The Option of Roundabout Interchanges". WesternITE. May 2000.

OURSTON, L.; HALL G.A. “Roundabout Increase Interchange Capacity.” ITE Journal. December 1997.

OURSTON, L.; HALL, G.A. "Modern Roundabout Interchanges Come to America". Leif Ourston, Presented to ITE 66th annual meeting in Minneapolis, MN, September 1996. Gregory A. Hall, co-author.

PEREZ, R.A.; ATCHISON, T. “Modern Roundabouts as an Access Management Tool”. 4th National Access Management Tool, August 2000.

PERSAUD, B.N.; RETTING, R.A.; GARDER, PER. E.; LORD, D. “Crash Reduction Following Installation of Roundabouts in the United States.” Insurance Institute for Highway Safety, March 2000.

REDINGTON, T. “Montpelier’s Modern Roundabout at Keck Circle – Neighborhood Opinion Survey.” Vermont Agency of Transportation, January 1997.

REDINGTON, T. “The Impact of Modern Roundabouts on North American Traffic Circulation, Modal Choice, Sustainable Development Land Use.” Canadian Transportation Research Forum 34th Annual Conference, 1999.

The thesis of this paper is that the modern roundabout significantly alters for the better traditional access equation that determines development densities, so that both current and planned land use densities can naturally increase in urban areas.

RETTING, RICHARD A.; FERGUSON, SUSAN A.; MCCARTT, ANNE T. “A Review of Evidence-Based Traffic Engineering Measures to Reduce Pedestrian-Motor Vehicle Crashes”. IIHA, 2003. This study provides a brief critical review and assessment of engineering and modifications to the built environment that can reduce the risk of pedestrian injuries.

RILLING, M. “Injury Accident Statistics – High Speed Roundabouts vs. High Speed Signals.” Washington State Department of Transportation (DOT)

RITCHIE, S. “Cotton Lane/Estrella Parkway Connection Roundabout Report”: Roundabout and Traffic Engineering (RTE), April 2005. This report outlines the analysis of the proposed design with information and recommendations to the Traffic Control device recommended for implementation (signal or roundabout) at the intersection of Cotton Lane/Estrella Parkway.

RITCHIE, S.; LENTERS, M.S. “High Speed Approaches At Roundabouts”.  East West Partners, California Department of Transportation and the Transportation Research Board at Vail Colorado, 2005.

RODGERDTS, L.A. “Progress on Proposed Roundabout Elements for HCM” HCQS Committee Workshop. January 21, 2006. The objectives of the workshop were to provide information to HCQS Committee on progress to date of NCHRP 3-65 and HCM procedure development. Moreover, to engage the Committee in discussion of key issues regarding progress.

RUNGE, C. “Linville Road Roundabout Study” Published by The Brown County Planning Commission, November 7, 2001.

RUSSELL E; RYS, M; LUTTRELL, G. “Roundabout Studies in Kansas”, 4th Transportation Specialty Conference of the Canadian Society for Civil Engineering. June 5 – 8, 2002. Montreal, Quebec, Canada


“Operational Performance of Kansas Roundabouts: Phase II.” May 2005

SARGEANT, S.; STEPHEN, C. “Performance Evaluation of Modern Roundabouts on South Golden Road”. The University of New Brunswick. March 2002.

The report provides a review of the selected corridor design, which incorporates four modern roundabouts and compares it to the original partially-signalized configuration.

SHIELDS, B. “133rd Street and Lamar Intersection Project.” An Intra-City communication while constructing a modern roundabout at the intersection of 133rd Street and Lamar Avenue was discussed. Kansas Department of Transportation (KDOT) April 27, 2005.

SCHUR, K; ABOS-SANCHEZ, J. “Effects of Central Island Landscaping Treatments at Single-Lane Roundabouts” Mid-America Transportation Center, Department of Civil Engineering, College of Engineering and Technology, University of Lincoln-Nebraska, March 2005.

STANEK, D; MILAN, R.T. “High-Capacity Roundabout Intersection Analysis: Going Around in Circles”. Fehr & Peers Associates Inc. 2004. This paper compares the capacity analysis suggested in the FHWA guide with the results of the analysis software packages RODEL, aaSidRA, VISSIM and Paramics.

TOTTEN SIMS HUBICKI ASOCIATES“Modern Traffic Circles/Roundabouts Study.” Assignment #9720-7362-2879, Ministry of Transportation Ontario, April 2000.

WADDELL, E., “Evolution of Roundabout Technology: A History-Based Literature Review,” Compendium of Technical Papers, 67th Annual Meeting, Institute of Transportation Engineers, Boston (August 1997).

WADDELL, E.; ALBERTSON, J. “The Dimondale Mini: America’s First Mini Roundabout.” TRB, Subcommittee on Roundabouts. International Conference on Roundabouts. Vail, Colorado, May 2005.

WEBER, P.; RITCHIE, S. “Internationally Recognized Roundabout Signs” May 2005. Paper for the Transportation Research Board, National Roundabout Conference, Vail, Colorado, Mary 22-25, 2005.

ZEGEER, C.V., STEWART, J.R., HUANG, H.H. “Safety Effects of Marked Versus Unmarked Crosswalks at Uncontrolled Locations.” U.S. Department of Transportation. FHWA-HRT-04-100, 2005.

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