 From here to St. Johnsbury, Vermont, I-91 parallels the river, never more than from its shore.I-91 then enters the Hartford city limits.In Hartford, I-91 it has a set of interchanges with US 5/Route 15 (Wilbur Cross Highway), which provides access from I-91 north to I-84 east, and from I-84 west to I-91 south via the Charter Oak Bridge.