1. School children are occupying or walking within the marked crosswalk.
2. School children are occupying or waiting at the curb or on the shoulder of the roadway and are about to cross the roadway by way of the marked crosswalk.
3. School children are present or walking along the roadway, either on the adjacent sidewalk or, in the absence of sidewalks, on the shoulder within the posted school speed limit zone which extends three hundred feet in either direction from the marked crosswalk.
“(1) When two vehicles approach or enter an intersection from different highways at approximately the same time, the driver of the vehicle on the left shall yield the right-of-way to the vehicle on the right.
(2) The right of way rule declared in subsection (1) of this section is modified at arterial highways and otherwise as stated in this chapter.” (see RCW 46.61.180)."