Bicycle Surface Condition Warning, Color
The Bicycle Surface Condition Warning sign may be installed where roadway or shared-use path conditions could cause a bicyclist to lose control of the bicycle. Signs warning of other conditions that might be of concern to bicyclists, including BUMP, DIP, PAVEMENT ENDS, and any other word message that describes conditions that are of concern to bicyclists, may also be used. A supplemental plaque may be used to clarify the specific type of surface condition.
Federal Highway Administration Manual on Uniform Traffic Control Devices for Streets and Highways, 2003 Edition (including 2004 and 2007 revisions) (Washington, DC: United States Department of Transportation, 2007)