Q. Regulations for Lights and Reflectors on a Commercial Motor Vehicle
49 CFR 393 Subpart B deals with lighting requirement for commercial motor vehicles.
For more information contact the Federal Motor Carrier Safety Administration (FMCSA) field office nearest you. To find the office nearest you, click here.
The FMCSA home page, with a wealth of information, is located at: http://www.fmcsa.dot.gov
Motor carrier federal regulations can be found in 49 CFR Chapter III.