(a) This subchapter shall be construed liberally to effect its purposes and neither this subchapter nor anything contained in this subchapter is or shall be construed as a restriction or limitation upon any powers which any local government or private owner or operator might otherwise have under any laws of this state, and the provisions of this subchapter are cumulative to any such powers.
(b) This subchapter does and shall be construed to provide a complete, additional, and alternative method for the doing of the things authorized thereby and shall be regarded as supplemental and additional to other laws.