TED -RETHINKING THE TRAFFIC INTERSECTION TO REDUCE ENERGY. 

Venture capitalist Gary Lauder has re-thought the need for standard signalized and un-signalized traffic intersections, in light of a study finding that roundabouts.

via PSFK: http://www.psfk.com/2011/09/rethinking-the-traffic-intersection-to-reduce-energy.html#ixzz1YETor970