Magic Roundabout, Swindon, England, United Kingdom

History
The roundabout was constructed according to the design of Frank Blackmore, of the British Transport and Road Research Laboratory, under the control of Highways engineer Jeff Maycock of Swindon Council. Traffic flow around the smaller, inner roundabout is anti-clockwise, and traffic flows in the usual clockwise manner around the five mini-roundabouts and the outer loop.
Local and regular users are proficient at traversing the complex junction, which offers multiple paths between feeder roads. Virtually the same overall configuration has been in place for over 30 years.
When the roundabout complex was first opened, the mini-roundabouts were not permanently marked out and could be reconfigured while the layout was fine tuned. A police officer was stationed at each mini roundabout during this pilot phase to oversee how drivers coped with the unique arrangement.