Falling Rocks, Silhouette Small 320×233 Medium 640×466 Large 1024×746 Download Tiff Original 3000×2185 | (181.9 KB) Download EPS Vector 381.0 KB Description This sign is used as a warning of the possible danger of falling rocks. Keywords danger, falling rocks, kservsilho, recreational sign, warning Galleries Service Signs Source: 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)