Details on Green Line retaining walls and noise barriers Post published:May 30, 2012 Post category:Green Line MassDOT has posted its presentation on retaining walls and noise barriers, from the May 22 public hearing. You Might Also Like Green Line construction on track January 17, 2019 Petition: Extend Green Line to Route 16 November 1, 2006 Send your comments to the state December 20, 2004