(a) The office of Associate County Commissioner in Cullman County shall hereafter be a full-time position and any person serving in such capacity shall devote full-time service to the duties and responsibilities of the office. In lieu of any annual salary now provided by law, an associate commissioner shall be entitled to an annual salary of twenty-six thousand five hundred dollars ($26,500) which shall be paid in equal monthly installments from the county treasury. The associate commissioner elected from the Eastern sector of the county shall be responsible for maintenance and construction of county roads situated to the East of U. S. Highway 31, Alabama Highway 69, and Interstate Highway 65 as such highways intersect to divide the county from North to South into Eastern and Western sectors. The other associate commissioner shall be responsible for the maintenance and construction of those county roads situated in such Western sector as bounded from North to South by the aforementioned state and federal highways.
(b) The provisions of this section are retroactive to January 1, 1984.