I hope the pedestrians always have the highest priority, but then what if there are two of them... Soon they'll use bluetooth to pull your net worth from your apple watch and steer towards the smallest number.
An adult running onto the highway is very different than a young kid doing the same.
All else equal, I would not preserve the adult's life over that of drivers. I would preserve the kid's life over that of drivers.
Why? The adult is presumed to be responsible for the repercussions of its actions. The drivers did not create the problem. The family of the drivers could hold others accountable for any unreasonable systemic danger leading to the death of the drivers.