 Route 3 North joins I-93 and US-1, and the highway turns north toward Boston.These first of I-93 follows what was formerly part of Massachusetts Route 128 before it was truncated at the I-95/I-93 junction and many locals still refer to this section of roadway as part of Route 128.Upon turning northward, the highway is known as the Southeast Expressway passing through Quincy and Milton before crossing into the city of Boston over the Neponset River.