Wyo. Stat. Ann. § 7-17-103
(a) For the purpose of warning and protecting the traveling public, the following minimum requirements shall be met by peace officers establishing temporary roadblocks if time and circumstances allow:
(i) The temporary roadblock shall be established at a point on the highway clearly visible at a distance of not less than two hundred (200) yards in either direction;
(ii) At the point of the temporary roadblock flashing warning lights shall be visible to oncoming traffic for a distance of not less than two hundred (200) yards. The display of flashing emergency warning lights on a marked law enforcement vehicle shall be sufficient under this paragraph; and
(iii) At least one (1) person working a temporary roadblock shall be in uniform and visible and at least one (1) vehicle used in a temporary roadblock shall be clearly marked as a law enforcement vehicle.