MA 4

Lexington to Lowell via Bedford and Billerica

Multiplexed with MA 225 in Bedford and Lexington.
Very brief multiplex with MA 110 in Chelmsford.

Rt 4 is basically unchanged since being created between 1930 and 1933. The 1930 ALA does not list it at all; the 1933 shows it starting in Lexington at the (then) intersection of 2A and 128.