Alex Tabarrok linked to a video of a British town's experiment with this on a roundabout: http://www.youtube.com/watch?v=vi0meiActlU&feature=player_embedded htt

Alex Tabarrok linked to a video of a British town's experiment with this on a roundabout: http://www.youtube.com/watch?v=vi0meiActlU&feature=player_embedded http://www.youtube.com/watch?v=vi0meiActlU&feature=playe... . They saw a 75% decrease in waiting time at the intersection.