[Code of Federal Regulations] [Title 49, Volume 5] [Revised as of October 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 49CFR393.87] [Page 432] TITLE 49--TRANSPORTATION DEPARTMENT OF TRANSPORTATION PART 393_PARTS AND ACCESSORIES NECESSARY FOR SAFE OPERATION--Table of Contents Subpart G_Miscellaneous Parts and Accessories Sec. 393.87 Warning flags on projecting loads. (a) Any commercial motor vehicle transporting a load which extends beyond the sides by more than 102 mm (4 inches) or more than 1,219 mm (4 feet) beyond the rear must have the extremities of the load marked with red or orange fluorescent warning flags. Each warning flag must be at least 457 mm (18 inches) square. (b) Position of flags. There must be a single flag at the extreme rear if the projecting load is two feet wide or less. Two warning flags are required if the projecting load is wider than two feet. Flags must be located to indicate maximum width of loads which extend beyond the sides and/or rear of the vehicle. [70 FR 48054, Aug. 15, 2005]