This is actually why I realized I dislike multiple choice answers marked by a machine... it necessitates such a binary right/wrong decision, whereas when you (over)think about some answers as I frequently do, you could argue that an answer deemed to be wrong is actually closer to the truth. You can NEVER cross the double yellow lines... but what if there's a ten car pile-up in your lane and you're frantically driving away from a pursuing tyrannosaurus? I think an exception could be made in that case, so is it "only if you have to"? Or is it what the driver's manual strictly says?

Or... you know, other, more serious considerations.