Federal Motor Vehicle Safety Standard 108 (FMVSS 108) regulates all automotive lighting, signalling and reflective devices in the United States. Like all other Federal Motor Vehicle Safety Standards, FMVSS 108 is administered by the United States Department of Transportation's National Highway Traffic Safety Administration.
Canada's analogous regulation is called Canada Motor Vehicle Safety Standard 108 (CMVSS 108), and is very similar to FMVSS 108. The primary differences are:
Both standards differ markedly from the UN (formerly "European") standards used in most other countries worldwide, not only in technical provisions, terminology, and requirements, but in format: each European standard deals with only one type of lighting device, while the single U.S. and Canadian standards regulate all lighting and reflective devices.