1958 Senate Bill 0512. An Act Providing For The Assumption By The Massachusetts Port Authority Of The Payment Of The Outstanding Bonds Of The State-Owned Airports, The Port Of Boston Commission, The Mystic River Bridge Authority And The Sumner Tunnel, That Tolls And Rates Charged By Said Authority Shall Be Subject To The Approval Of The Department Of Public Utilities, And Directing Said Authority To Proceed Forthwith To Construct An Additional Crossing From Boston Proper To East Boston.