Wyo. Stat. § 24-7-103: Application of W.S. 24-1-127, 24-7-101 through 24-7-103.

This enactment shall have no application to the usual and necessary diversion of traffic for purposes of road repair or reconstruction, nor shall it apply to any city having a population of more than twenty thousand (20,000), nor shall the provisions of this act be retroactive from the effective date of this act.