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Interstate 91 (I-91) is an Interstate Highway in the New England region of the United States. It provides the primary north\south thoroughfare in the western part of the region. The Interstate generally follows the course of the Connecticut River. Its southern end is in New Haven, Connecticut, at Interstate 95. The northern end of the American-maintained road is in the village of Derby Line, Vermont, at the Canadian border. I-91 then continues past the Derby Line\Rock Island Border Crossing, where the road's official name changes to Autoroute 55. I-91 is the longest of three Interstate highways whose entire route is located within the New England states (the other two highways being I-89 and I-93) and is also the only primary (two-digit) Interstate Highway in New England to intersect all five of the others that run through the region. The largest cities along its route are New Haven, Connecticut, Hartford, Connecticut, Springfield, Massachusetts, Northampton, Massachusetts, Greenfield, Massachusetts, Brattleboro, Vermont, White River Junction, Vermont, and St. Johnsbury, Vermont in order from south to north....Full Wikipedia Topic
This highway passes through multiple states or provinces. Each is broken out sepeperatly in these listings.