Canton to NH line in Methuen via Boston
I-93 first appears as proposed or under construction north of Boston in 1958. By 1961, the highway was built from Medford to Lawrence. By 1966, it was complete to the NH border.
In the Boston area, the southern end of 93 was Mystic Ave in Somerville. Between 1972 and 1974, the highway was extended south to meet the Central Artery and I-95. In 1975, I-95 was rerouted onto MA 128 and I-93 took over from where they intersected to Quincy. By 1977, it had been extended westward from Quincy to Canton.