Vt. Stat. tit. 19 § 1501
The State of Vermont assents to, approves, and pledges its good faith to meet the terms of an act of Congress approved July 11, 1916, entitled "An Act To provide that the United States shall aid the States in the construction of rural post roads, and for other purposes," and amendments to the act, including flight strips, and the Agency is authorized to take such action as may be necessary to secure to the State the aid and benefits provided by the Act. Whenever the Agency of Transportation determines that funds otherwise authorized to be appropriated to the State under the Federal Aid Road Act, as amended and supplemented, shall not be apportioned to the State if the National System of Interstate Highways within its boundaries may lawfully be used by vehicles with any dimension or with weight in excess of the maximum corresponding dimension or the maximum corresponding weight provided for use on these highways in the Act, as amended and supplemented, the Governor shall so declare by proclamation, and thereafter these highways shall not lawfully be used by vehicles with any dimension or with weight in excess of the maximum corresponding dimension or the maximum corresponding weight so provided.
19 V.S.A. § 1501