Detour Arrow, Color
Each detour shall be adequately marked with standard temporary route signs and destination signs. Detour signs in TTC incident management situations may have a black legend and border on a fluorescent pink background. The Detour Arrow sign may be used where a detour route has been established. The Detour Arrow sign should normally be mounted just below the ROAD CLOSED sign. The Detour Arrow sign should include a horizontal arrow pointed to the right or left as required.
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)