§ 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.