MA 3A

General Routing

Sagamore to NH border via via Plymouth, Cohasset, Hingham, Quincy, Boston, Burlington, Tyngsboro, Billerica and Lowell.

Upgrades & Multiplexes

Brief multiplex with MA 113 in Tyngsborough.
Cosigned with MA 129 in Billerica.
Multiplexed with MA 62 in Burlington.
Cosigned with MA 139 in Marshfield.
Secretly cosigned on US 3 / MA 3 from Burlington to Quincy.

History

I originally thought this was a split route because the 3A designation piggybacks on route 3 for most of its course inside MA 128.

The southern portion was originally NE-6A. In 1933, southern 3A existed between Kingston and Quincy as it does now. By 1956, the section of MA 3 south of Kingston had become 3A.

The northern 3A makes its first appearance between 1942 and 1946, as US 3 is re-routed onto a new road bypassing Lowell. Between 1953 and 1956, US 3 became a highway and 3A was extended to include all of the former US 3 routing.

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