Every operator of a vehicle approaching an intersection at which an Official Traffic Control Device is erected in accordance with this Chapter shall obey the direction of such Official Traffic Control Device as required by the Wisconsin Statutes incorporated by reference in Section 10-1-1 of this Chapter. Operators of vehicles approaching a stop sign shall stop before entering a highway as required by Sec. 346.46, Wis. Stats. Operators approaching intersections at which a yield sign has been installed shall yield the right-of-way to other vehicles as required by Sec. 346.18(6), Wis. Stats.