Wyo. Stat. § 24-1-128
All center markings and supplementary road shoulder markings on all highways within the boundaries of the state of Wyoming completed in asphalt, oil, concrete, or other hard surface shall be maintained with bright yellow lines, whether or not said markings be solid or broken yellow lines. The director of the department of transportation shall have the duty to enforce the provisions of this section and to provide for the effective maintenance of said yellow markings. The state transportation commission after a hearing may waive the application of this section to any highway or highway project if necessary to promote a safe and effective utilization of such highway or highway project. The governor and the president of the senate and the speaker of the house of representatives of the state of Wyoming shall be notified in writing at least five (5) days before the hearing.
W.S. 24-1-128