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Detail from the November 20, 1992 flyer by Joel Pomerantz which introduced the concept of corking.
Because Critical Mass takes place without an official route or sanction, participants practice a tactic known as "corking" in order to maintain the cohesion of the group. This tactic consists of a few riders blocking traffic from side roads so that the mass can freely proceed through red lights without interruption. Corking allows the mass to engage in a variety of activities, such as circling in an intersection, or lifting their bikes in a tradition known as a Chicago hold-up. The 'Corks' sometimes take advantage of their time corking to distribute flyers.
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This article or parts of this article are based on the Wikipedia article Critical_Mass (Version from September 9, 2007) 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.