Vermont
Vermont is a state in New England, named for its "green mountains".
In terms of legality, be advised that hitching is illegal along U.S. Routes in Vermont. These include Routes 2, 4, 5, 7 and 302. On the other hand, the cops in Vermont are usually very chill and I've never heard of anyone getting a ticket for hitchhiking there.
The two major interstates in Vermont are I-89 and I-91.
91 parallels the Connecticut River along the Eastern side of the state. It's the main artery for traveling to points North (Montreal, Sherbrooke, Quebec City) or South (New York, Springfield, Hartford). Most of the exits along the way lead to small towns, which can sometimes make for very little traffic. In fact, aside from St. Johnsbury, Brattleboro and White River Junction, there really aren't any high-traffic onramps, so don't get stuck in small towns like Ascutney.
I-89
