The sheriff of each county and his or her deputies who are engaged in law-enforcement activities may, in the discretion of the sheriff, use a motor vehicle owned by the county to travel from his or her residence to his or her workplace and return. Any other county official or employee may, or may not, in the discretion of the county commission, be furnished with the use of a motor vehicle owned by the county to travel from his or her residence to his or her workplace and return: Provided, That such usage is subject to the supervision of said sheriff or commission and is directly connected with and required by the nature and in the performance of such sheriff's, deputy's, county official or employee's duties and responsibilities.