The second named street in the list of intersections, as set forth by the town from time to time, is designated as a main traveled or through street, and the Administrator shall erect yield right-of-way signs on the first named street at the entrance to the main traveled or through street. The effect of the yield right-of-way signs on vehicles and pedestrians shall be as provided in G.S. §§ 20-158.1 and 20-172.