When stop signs are placed, erected, or installed on streets intersecting a through street designated as provided in § 70.40 at the entrance thereto, or at the entrance to any intersection, or at any stop intersection so designated, every driver of a vehicle shall stop in obedience to the signs before entering the intersection and shall not proceed into or across the intersection until he or she has first determined that no conflict with traffic will be involved.
(1989 Code, § 71.77) Penalty, see § 10.99