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Reasons for using, and how to use, the "Bicyclists may use full lane" signs [PDF file]. A report from the NCUTCD committee that is recommending that this sign be officially adopted in the Manual of Uniform Traffic Control Devices (MUTCD). In the meanwhile the sign may still be used under MUTCD--the report is simply suggested a single uniform version of the sign be adopted as standard by MUTCD. The sign articulates a law that is in effect in all 50 states, which states that when the lane is too narrow to share between a motorist and bicyclist (any less 12 ft or less) then the bicyclist may use the full lane and is not required to squeeze to the right to share with the motorist.