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From Boston International Airport:
Stay straight to go onto Airport exit
Turn slight left to take the RT-1A South ramp towards Sumner Tunnel/Boston
Merge onto MA-1A S/William F McClellan Highway
MA-1A S/William F McClellan Highway becomes MA-1A S/Sumner Tunnel
MA-1A S/Sumner Tunnel /William F McClellan Highway becomes MA-1A S.
Take the I-93 North/US-1 North/RT-3 North ramp.
Merge onto US-1 N/Central Artery/Fitzgerald Expressway
US-1 N/Central Artery/Fitzgerald Expressway becomes US-1 N/I-93 N.
Take I-93 N towards Concord NH.
Take the RT-16/Mystic Valley Parkway exit, exit #31, towards Arlington
Enter next roundabout and take 2nd exit onto Alewife Brook Parkway/MA-16 W.