Roundabouts

Q&A: Roundabouts

Informational video

Research papers

Public opinion, traffic performance, the environment, and safety after the construction of double-lane roundabouts; Wen Hu, Anne T. McCartt, Jessica S. Jermakian, Srinivas Mandavilli, February 2013

Continued reliance on traffic signals: the cost of missed opportunities to improve traffic flow and safety at urban intersections; Casey Bergh, Richard A. Retting, Edward Myers, September 2005

Selected research bibliography

Highlights from the Institute's research since 1969

Status Report newsletter articles

Vol. 48, No. 2, March 14, 2013: Two-lane roundabouts improve safety but bring some confusion

Vol. 45, No. 11, November 3, 2010: Roundabouts are reducing crashes in Carmel, Indiana, where they outnumber intersections with signals

Vol 43, No. 4, June 9, 2008: Roundabouts can be even safer with some simple changes like better signs, lights

Vol. 40, No. 9, November 19, 2005: Best time to consider a roundabout? When a road is being built or an intersection is scheduled for modification • Clearwater, Florida roundabout • Vail, Colorado roundabout

Vol. 40, No. 7, August 6, 2005: Urban arterials don't have to undergo major re-engineering to reduce crashes and improve traffic flow

Vol. 38, No. 8, August 26, 2003: More and more roundabouts in use

Vol. 36, No. 7, July 28, 2001: Roundabouts reduce traffic backups as well as crashes involving injuries • Motorists' acceptance of roundabouts increases with experience

Vol. 35, No. 5, May 13, 2000: Roundabouts are becoming more familiar on US roads, not just for safety reasons • New FHWA guide to roundabouts

Regulatory comment

Comment to the Agriculture and Transportation Barriers Compliance Board concerning installations of traffic signals on pedestrian crosswalks at all roundabouts, October 23, 2002