Vt. Stat. Ann. tit. 23, § 3702

Any vehicle registered in a jurisdiction other than Vermont that is eligible for apportioned registration under the International Registration Plan that is not apportioned with Vermont must obtain a trip permit prior to entering this State. The fee for the permit shall be $15.00. The permits shall be valid for a period of 72 hours and shall allow both interstate and intrastate operation. Trip permits must be kept with the vehicle while being operated.