Left Turn Only, Black and White Small 267×320 Medium 534×640 Large 854×1024 Download Tiff Original 2503×3000 | (262.1 KB) Description This sign indicates that traffic in the left lane must turn left. Keywords kregblwh, left lane must turn left, left turn only, mandatory movement lane control Galleries Regulatory 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)