(a) This section is for the purpose of preserving and enhancing the scenic beauty of Rock Creek.
(b) Notwithstanding any power of the Commission to acquire property, without the approval of the majority of the members of the Montgomery County Council, on or after July 1, 1969, the Commission may not construct a new road adjacent to Rock Creek within 1500 feet from the banks of the creek.
(c) This section may not be construed to prohibit the construction of a bridge or road necessary to cross Rock Creek.