Cambridge replaced an intersection with a roundabout close to my old apartment in Preston. It was there when I first visited the area 4 years ago, but still doesn't show up on Google Maps.
It's actually a fairly nice roundabout too. It has a very nice circular garden in the centre and pedestrian crossings on all sides to service the nearby trails. The intersection is relatively busy and handles a lot of turning vehicles like haljackey mentioned. Fountain Street heads East to downtown Preston while Blair Road heads South to downtown Galt; both major centres in Cambridge.
I've biked, bused and been driven through this roundabout hundreds of times and I've never seen any traffic hiccups. I've never experienced a major arterial roundabout, but I
love how smoothly these smaller roundabouts can flow.
Roundabouts are definitely another leaf London could take out of KW's book.
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