http://tomscott.com – http://twitter.com/tomscott – Despite its reputation as being a Traffic Circle of Hell, Swindon’s Magic Roundabout — like the couple of other “ring junctions” in the UK — is a triumph of road design. Here’s why it works so well.
For more information on this, its small number of siblings across the country, and why popular opinion’s still against it, have a look at its CBRD entry: https://www.roads.org.uk/articles/the-magic-roundabout/