[Code of Federal Regulations] [Title 49, Volume 4] [Revised as of October 1, 2003] From the U.S. Government Printing Office via GPO Access [CITE: 49CFR393.20] [Page 1098-1099] TITLE 49--TRANSPORTATION CHAPTER III--FEDERAL MOTOR CARRIER SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION PART 393--PARTS AND ACCESSORIES NECESSARY FOR SAFE OPERATION--Table of Contents Subpart B--Lighting Devices, Reflectors, and Electrical Equipment Sec. 393.20 Clearance lamps to indicate extreme width and height. Clearance lamps shall be mounted so as to indicate the extreme width of the motor vehicle (not including mirrors) and as near the top thereof as practicable: Provided, That when rear identification lamps are mounted at the extreme height of the vehicle, rear clearance lamps may be mounted at optional height: And provided further, That when mounting of front clearance lamps at the highest point of a trailer results in such lamps failing to mark the extreme width of the trailer, such lamps may be mounted at optional height but must indicate the extreme width of the trailer. Clearance lamps on truck tractors shall be so located as to indicate the extreme width of the truck tractor cab. [[Page 1099]] [GRAPHIC] [TIFF OMITTED] TC01AP91.028 Diagram to illustrate Sec. 393.20 for mounting of front clearance lamps on truck tractors with sleeper cabs.) [GRAPHIC] [TIFF OMITTED] TC01AP91.029 [33 FR 19735, Dec. 25, 1968, as amended at 34 FR 6851, Apr. 24, 1969]