§ 669.3 Policy.
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
It is the policy of the FHWA that each state require registrants of heavy trucks as described in 26 CFR part 41 to provide proof of payment of the vehicle use tax either before lawfully registering or within 4 months after lawfully registering such vehicles as provided for under a suspension registration system.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.