How many commenters are members of the "Gentlemen's Club"? Anywho.. if you don't get why the comparison was made between the Polytechnique massacre and the attitude of these "gentlemen"; you're part of the problem.
Roundabouts are fabulous. And there is no "critical mass" because you can build them to any size, including back streets. I've lived in Oz for 8 years now and worked in city planning. I'm a convert to how convenient they make traffic.
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