(a) The State Department of Transportation may set the speed limits in urban and rural construction zones along state and interstate highways and the county commission of a county may set the speed limits in urban and rural construction zones along county roads or highways. The construction zone speed limits shall be posted on the department's standard size speed limit signs at least one hundred feet in advance of the entrance to a construction zone. Law enforcement authorities shall enforce construction zone speed limits. Upon conviction of a construction zone speed violation, the operator of the motor vehicle shall be assessed a fine of double the amount prescribed by law outside a construction zone. The fine shall only be doubled for construction zone violations if construction personnel are present and that fact is indicated by appropriate signs. The signs, placed at the entrance of the construction zone, shall warn of the doubled fines for speeding within a construction zone. The signs shall also state that the doubled fines are applicable only when construction personnel are present.
(b) The State Department of Transportation may promulgate and implement administrative rules and procedures as it deems necessary to both carry out the provisions of subsection (a) on state and interstate highways and to ensure the safety of private and public construction and maintenance personnel working in designated construction zones on state and interstate highways. A county commission may promulgate and implement administrative rules and procedures as it deems necessary to carry out the provisions of subsection (a) on county roads and highways provided the rules and procedures are not in conflict with those set by the State Department of Transportation.
(c) A person subject to a penalty pursuant to this section shall not be assessed additional court costs on conviction.