Heavy-Duty Hybrid Electric Vehicle Certification Procedures
The Heavy-Duty Hybrid Electric Vehicle Interim Certification Procedures provide a protocol for heavy-duty hybrid-electric vehicle manufacturers seeking voluntary vehicle-based (as opposed to engine-based) certification.
More about this program
Interim Certification Procedures Regulation
The certification procedures are applicable to new 2004 and subsequent model year heavy-duty (i.e., greater than 14,000 lbs gross vehicle weight rating) hybrid-electric vehicles including hybrid-electric urban buses and other hybrid vehicles.
Zero- and near-zero emission technologies
NOx emissions from heavy-duty hybrid vehicles