 The remainder of the right of way in Billerica is fragmented.The portion between Concord Road and the Concord River had become overgrown with fairly substantial trees, but a portion was recently recleared and paved as a driveway into a new commercial development that is not yet completed.On the north side of the Concord river, short section now called Old Middlesex Turnpike serves a few blocks in a residential neighborhood, but a gate blocks access to the river.