Wyo. Stat. § 24-6-109
In connection with the development of any access facility the state, county, city, town, or village highway authorities are authorized to plan, designate, establish, use, regulate, alter, improve, maintain, and vacate local service roads and streets or to designate as local service roads and streets any existing road or street, and to exercise jurisdiction over service roads in the same manner as is authorized over access facilities under the terms of this act, if in their opinion, such local service roads and streets are necessary or desirable. Such local service roads or streets shall be of appropriate design, and shall be separated from the access facility proper by means of all devices designated as necessary or desirable by the proper authority.
W.S. 24-6-109