(a) 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 and, if required for safety to stop, shall stop at a clearly marked stop line, but if none, before entering the crosswalk on the near side of the intersection, or if none, then at the point nearest the intersecting roadway where the driver has a view of approaching traffic on the intersecting roadway. After slowing or stopping, the driver shall yield the right of way to any vehicle in the intersection or approaching on another roadway so closely as to constitute an immediate hazard during the time such driver is moving across or within the intersection.
(b) If a driver is involved in a collision at an intersection or interferes with the movement of other vehicles after driving past a yield right of way sign, such collision or interference shall be deemed prima facie evidence of the driver's failure to yield right of way. Such intersections are set forth in exhibit C at section 22-163 of this chapter. (M.C. 1963, § 20.204)