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Cyclones form when the mass begins to circle an intersection. Popular in Chicago's large six-point intersections, cyclones can be used to "mass up" the Critical Mass, so that it can maintain the density of cyclists necessary to prevent the flow of automotive traffic. The tactic also allows splinter masses time to rejoin the group. Also known as "Circle of Death" in some regions.
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This article or parts of this article are based on the Wikipedia article Critical_Mass (Version from February 20, 2009) licensed under the terms of the GNU Free Documentation License, version 1.2 or later. A list of the authors can be found here: [1]. You can help to improve the article.