Since their first appearance, Orange Construction Barrels have spread across the continent largely unchecked. Highway harvesting crews attempt to keep the roadways clear during the summer growing season, but there is never enough manpower to remove barrels before they mature and spread their seeds. In Europe the natural predator of pillaforms is the mighty erosionary force of soccer riots. Soccer riots (and their smaller British cousins the hooligans) are completely unknown in North America and efforts to import them have met with little success.