23 C.F.R. § 669.1 Scope and purpose.
Title 23 - Highways
To prescribe requirements for certification by the states that evidence of proof of payment is obtained either before vehicles subject to the Federal heavy vehicle use tax are lawfully registered or within 4 months after being lawfully registered if a suspension registration system is implemented.
Title 23: Highways
PART 669—ENFORCEMENT OF HEAVY VEHICLE USE TAX
§ 669.1 Scope and purpose.
