Those intersections described in Chapter 73, Schedule II are hereby declared to be stop intersections when entered from the streets first named, and when stop signs are placed, erected or installed at the intersections, every driver of a vehicle or street car shall stop in obedience to the signs before entering the intersection, and shall not proceed into or across the through street until he or she has first determined that no conflict with traffic will be involved.
(1940 Code, Ch. G, Art. VI, § 2) Penalty, see § 71.99