United States

Environmental Protection Agency

Federal Highway Administration

Federal Motor Carrier Safety Administration

National Highway Traffic Safety Administration

Occupational Safety and Health Administration

Federal Register

Code of Federal Regulations

Canada

Environment Canada

Transport Canada

Canada Gazette

Mexico (Sites are in Spanish)

SECOFI (VIN Number)

SEMARNAP / INE (Mexican Emissions Norms)

SEMARNAP / PROFEPA (Mexican Noise Norms)

SCT (Mexican Highway Safety Norms)