23 C.F.R. § 669.7 Certification requirement.
Title 23 - Highways
The Governor of each state, or his or her designee, shall certify to the FHWA before July 1 of each year that it is obtaining proof of payment of the heavy vehicle use tax as a condition of registration in accordance with 23 U.S.C. 141(d). The certification shall cover the 12-month period (8 months for the initial certification period) ending May 31.
Title 23: Highways
PART 669—ENFORCEMENT OF HEAVY VEHICLE USE TAX
§ 669.7 Certification requirement.