Section 11. Meeting of board; official seal

The board of transportation
  shall hold stated meetings at least once a month during the year at  its
  principal  office.  The board shall have an official seal, the design of
  which shall be adopted by the board and filed with  the  city  clerk.  A
  majority  of the members of the board may transact any business, perform
  any duty or exercise any power of the board. Any member or commissioner,
  or deputy commissioner, may hold any hearings authorized or required  to
  be held by or before the board or superintend the opening of any bids or
  proposals,  but  a record shall be made of all hearings upon charges and
  together with any recommendations, shall be referred to  the  board  for
  decision.  All proceedings of the board and all documents and records in
  its possession shall be public records, and open to  public  inspection,
  except  such  documents  and  records as shall be prepared by or for the
  counsel for use in actions or proceedings to which the city or the board
  of transportation is a party.