California Air Resources Board

The On-Road Heavy-Duty Certification Program is responsible for the certification of new vehicles with gross vehicle weight ratings greater than 8500 lbs and engines installed in such vehicles to the applicable emissions standards and other requirements contained in the California regulations and test procedures for heavy-duty engines and vehicles. Vehicles with gross vehicle weight ratings 8,500-14,000 lbs and engines installed in such vehicles may be certified using the heavy-duty engine or light-duty chassis certification procedures. The certification process ensures that new heavy-duty engines and vehicles produced in California meet current emissions standards.