(1) Local authorities in their respective jurisdictions shall place and maintain traffic control devices upon highways under their jurisdiction that they consider necessary to indicate and to carry out the provisions of this chapter or local traffic ordinances or to regulate, warn, or guide traffic. All traffic control devices must conform to the state manual and specifications.
(2) (a) An automated enforcement system designed to detect traffic violations that is attached to a traffic control device may not be used to enforce traffic laws.
(b) Subsection (2)(a) does not apply to automated enforcement systems attached to traffic control devices at railroad grade crossings.