[Code of Federal Regulations] [Title 49, Volume 5] [Revised as of October 1, 2005] From the U.S. Government Printing Office via GPO Access [CITE: 49CFR392.33] [Page 359] TITLE 49--TRANSPORTATION DEPARTMENT OF TRANSPORTATION PART 392_DRIVING OF COMMERCIAL MOTOR VEHICLES--Table of Contents Subpart D_Use of Lighted Lamps and Reflectors Sec. 392.33 Obscured lamps or reflective devices/material. (a) No commercial motor vehicle shall be driven when any of the lamps or reflective devices/material required by subpart B of part 393 of this title are obscured by the tailboard, or by any part of the load or its covering, by dirt, or other added vehicle or work equipment or otherwise. (b) Exception. The conspicuity treatments on the front end protection devices of the trailer may be obscured by part of the load being transported. [70 FR 48025, Aug. 15, 2005]