WY Stat § 31-5-403 (2021)
2021 Wyoming Statutes|Title 31 - Motor Vehicles|Chapter 5 - Regulation of Traffic on Highways|Article 4 - Traffic-Control Devices|Section 31-5-403 - Signal Legend Generally.

31-5-403. Signal legend generally.| (a) Whenever traffic is controlled by traffic-control signals exhibiting different colored lights, or colored lighted arrows, successively one (1) at a time or in combination, only the colors green, red and yellow shall be used, except for special pedestrian signals carrying a symbol or word legend, and the lights shall indicate and apply to drivers of vehicles and pedestrians as follows:  (i) Green indication:  (A) Vehicular traffic facing a circular green signal may proceed straight through or turn right or left unless a sign prohibits either turn. But vehicular traffic, including vehicles turning right or left, shall yield the right-of-way to other vehicles and to pedestrians lawfully within the intersection or an adjacent crosswalk at the time the signal is exhibited;  (B) Vehicular traffic facing a green arrow signal, shown alone or in combination with another indication, may cautiously enter the intersection only to make the movement indicated by the arrow, or such other movement as is permitted by other indicators shown at the same time. The vehicular traffic shall yield the right-of-way to pedestrians lawfully within an adjacent crosswalk and to other traffic lawfully using the intersection;  (C) Unless otherwise directed by a pedestrian-control signal, as provided by W.S. 31-5-404, pedestrians facing any green signal, except when the sole green signal is a turn arrow, may proceed across the roadway within any marked or unmarked crosswalk.  (ii) Steady yellow indication:  (A) Vehicular traffic facing a steady circular yellow or yellow arrow signal is thereby warned that the related green movement is being terminated or that a red indication will be exhibited immediately thereafter;  (B) Pedestrians facing a steady circular yellow or yellow arrow signal, unless otherwise directed by a pedestrian-control signal as provided by W.S. 31-5-404, are thereby advised that there is insufficient time to cross the roadway before a red indication is shown and no pedestrian shall then start to cross the roadway.  (iii) Steady red indication:  (A) Vehicular traffic facing a steady circular red signal alone shall stop at a clearly marked stop line, but if none, before entering the crosswalk on the near side of the intersection or, if none, then before entering the intersection and shall remain standing until an indication to proceed is shown except as provided in subparagraph (C) of this paragraph;  (B) Vehicular traffic facing a steady red arrow signal shall not enter the intersection to make the movement indicated by the arrow and, unless entering the intersection to make a movement permitted by another signal, shall stop at a clearly marked stop line, but if none, before entering the crosswalk on the near side of the intersection, or if none, then before entering the intersection and shall remain standing until an indication permitting the movement indicated by the red arrow is shown except as provided by subparagraph (C) of this paragraph;  (C) Except when a sign is in place prohibiting a turn, vehicular traffic facing any steady red signal may cautiously enter the intersection to turn right, or to turn left from a one-way street into a one-way street after stopping as required by subparagraphs (A) and (B) of this paragraph. The vehicular traffic shall yield the right-of-way to pedestrians lawfully within an adjacent crosswalk and to other traffic lawfully using the intersection;  (D) Unless otherwise directed by a pedestrian-control signal as provided by W.S. 31-5-404, pedestrians facing a steady circular red or red arrow signal alone shall not enter the roadway.  (b) If an official traffic-control signal is erected and maintained at a place other than an intersection, this section is applicable except as to those provisions which by their nature can have no application. Any stop required shall be made at a sign or marking on the pavement indicating where the stop shall be made, but in the absence of any sign or marking the stop shall be made at the signal.