The triple-concurrency of Routes 1, 6, and 28 continued through the Emerald Necklace following the Jamaicaway, the Riverway, and a short section of Boylston Street to Charlesgate, and then crossed the Charles River using the Harvard Bridge. After crossing the river, Route 6 split off to the west along Memorial Drive, while Routes 1 and 28 followed local streets in Cambridge and Somerville (Windsor Avenue, Webster Avenue, Walnut Street) to reach the Fellsway. The two routes crossed the Mystic River on the Fellsway and split at the intersection with the Revere Beach Parkway. From there, Route 28 continued along the Fellsway towards Medford Center. North of Medford, Route 28 utilized the alignment of the old Andover and Medford Turnpike through the Middlesex Fells Reservation into Reading. It then continued on the Andover branch of the old Essex Turnpike through Andover and Lawrence to the New Hampshire state line.