Tractor-Trailer Greenhouse Gas Aero Device Approval Program
The TTGHG Aero Device Approval Program allows aerodynamic device manufacturers to obtain a preliminary approval for the measured performance of aerodynamic drag reduction technologies.
More about this program
Email Updates
Keep up to date with the latest information regarding the TTGHG Interim Aero Device Approval Program.
California diesel truck information
Regulation & Reporting
Phase 1 & Phase 2