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Boston. Several exits were removed from I-93 to address traffic problems in addition to converting the Central Artery from 6 to 8 to 10 lanes, by reducing the combined number of on- and offramps from 27 to 14. Exit 46 (formerly 48) in Methuen, just before the New Hampshire state line, is the highest-numbered exit along the entire route. I-93 once had only 22 exits prior to the rerouting of I-95 onto Route 128. Nearly the entire length of I-93 in Massachusetts carries four lanes

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