[With regard to any county which is required to operate on a countywide system of road administration as described in Section 19-2-3, this section shall read as follows:]
(1) The board of supervisors in each county is to have and is required to exercise jurisdiction over the public highways of the county.
(2) The board of supervisors may by order duly adopted and entered on its minutes, provide for such transportation of individual members of the board as is necessary and essential in the performance of their official duties.