A. Preferential right of way at an intersection may be indicated by stop signs or yield signs as authorized in section 9-4-9 of this chapter.
B. Except when directed to proceed by a police officer or traffic control signal, every driver of a vehicle approaching a stop intersection indicated by a stop sign shall stop as required by section 9-4-9 of this chapter and after having stopped shall yield the right of way to any vehicle which has entered the intersection from another roadway or which is approaching so closely on said roadway as to constitute an immediate hazard, but said driver having so yielded may proceed and the drivers of all other vehicles approaching the intersection shall yield the right of way to the vehicle so proceeding.
C. The driver of a vehicle approaching a yield sign shall, in obedience to such sign, slow down to a speed reasonable for the existing conditions, or shall stop if necessary as provided in section 9-4-9 of this chapter, and shall yield the right of way to any pedestrian legally crossing the roadway on which he is driving, and to any vehicle in the intersection or approaching on another roadway so closely as to constitute an immediate hazard. Said driver having so yielded may proceed and the drivers of all other vehicles approaching the intersection shall yield to the vehicle so proceeding; provided, however, that if such driver is involved in a collision with a pedestrian in a crosswalk or a vehicle in the intersection after driving past a yield sign without stopping, such collision shall be deemed prima facie evidence of his failure to yield the right of way. (1960 Code, Sec. 7-904)