[Dueller]

Actually this is a concept found in many ordinances considered "preempting the intersection." Basically it says that if some one is in the intersection you can't just plow into them even if you have the right of way. For example, if someone stops at a stop sign then pulls into the street and their car stalls in the middle of the intersection or has to suddenly stop, you can't ram them even if you're on a thru street. Not saying that is what your sister did. Glad she and nephew are OK.