I'd like to make an amendment to the route. I'd say stick on rt 106 all the way until it meets/merges with 3a and then take 3a to the Sagamore bridge and you can stay on 6a or head to your Cape destination. 3a takes you down through "down town" Plymouth, expect a little congestion through all of the shops and restaurants, after that its just miles of scenic driving along the coast to the Cape.
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