A roundabout, rotary (the term used almost universally in the US state of Massachusetts), or gyratory circus is a type of road junction (or traffic calming device) at which traffic streams around a central island, after first yielding to the circulating traffic. In the United States it is technically called a "modern roundabout", to emphasize the distinction from the older, larger type of traffic circle. Roundabouts are statistically safer than both traffic circles and traditional intersections, though they do not cope as well with the traffic on motorways or similar fast roads.

Alaska Roundabouts - Shows different facilities, with a focus on Alaska. Also discusses technical aspects.
Center for Transportation Research and Training - Gives descriptions and comparisons to traffic circles. Includes a photo gallery of selected examples.
Magic Roundabouts - Compilation of features with this design in the United Kingdom.
Modern Roundabouts - Information including a list of all in the United States and Canada.
Modern Roundabouts - Overview and photographic examples. Part of a designer's website.
Meta Description: [ Alternate Street Design, P.A. provides professional street
design consulting services. We special in finding solutions to the toughest of traffic
challenges. No challenge is too big or tough to solve. ]
MTJ Engineering - Focuses on roundabout planning, design, and construction. Site includes project list and news.
NorthEast Area Roundabouts - Resource page focusing on the Northeast U.S. but covering a wide area.
Roundabouts - Description, benefits, what drivers and pedestrians should do in a roundabout, and links. From Genesee Transportation Council, New York.
Roundabouts Canada - Consultancy. Includes a forum. Contains a webcam of the first modern roundabout in the country, in Hamilton, Ontario.
Meta Description: [ Ourston Roundabout Canada Roundabout Engineering ]
Roundabouts: An Informational Guide - Document by the Turner-Fairbank Highway Research Center, part of the United States Federal Highway Administration.
Meta Description: [ This is the Turner-Fairbank Highway Research Center. ]
RoundaboutsUSA - Written by road engineers. Includes a history, a description of design basics, photos, and links.
SwindonWeb - Magic Roundabout - Photographs and description of this complex intersection in England.
Meta Description: [ Everything you need to know about Swindon ]
The Landlocked Navigator's Roundabout Adventure - Observations, with photographs, of the Magic Roundabout in Swindon, England.
Meta Description: [ The Digital Norseman: Musings - A view of the monster roundabouts in Brittain. Story with pictures. ]
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