 They are doing some culvert replacement work on Main Street in Somersworth. That work will require closing a section of Main Street for one day. In Dover, sections of Mass Road will be back to a single lane starting today. Mass Road at 271 Mass Road will be reduced to a single lane of alternating two-way traffic managed by temporary signals beginning today. The single lane is between the two driveways of the Pierre Bouchard Public Works facility at all times for the next eight weeks or so as well.