045-24 Wyo. Code R. § 24-7
(a) Beautification of the right-of-way by adjacent landowners or local municipalities is allowed when it does not compromise the highway's safety or integrity. Any firm or individual wishing to modify the right-of-way shall submit a request on Form M-26 to the Department district office for the area in which the property is located.
(b) Landscaping shall be for aesthetic purposes only and shall not be used for business or residential purposes.
(c) Drainage shall be maintained through a landscape area. All shrubbery or trees planted in the right-of-way shall be at least 50 feet from the edge of traveled ways in rural areas and consistent with surrounding property in urban areas. Setback for all shrubbery shall meet local municipal codes and shall not restrict sight distance beyond the minimum established by the Department.
045-24 Wyo. Code R. § 24-7