Notwithstanding any other provision of law, the Board of Supervisors of Merced County may abolish the office of road commissioner if the board transfers all duties of the road commissioner to the county director of the department of public works. The director of that department shall not be required to have any special permit, registration, or license. Any civil engineering functions that are required to be performed by the road commissioner shall be performed by a registered civil engineer acting under the authority of the director of that department.