On a three-lane highway where the centre lane is a passing lane, you see a sign reading "YIELD CENTRE LANE TO OPPOSING TRAFFIC". You are on the single-lane side and want to pass. What does it require of you?

Correct answer: A. Oncoming traffic has the right-of-way in that lane — pass with caution and pull out of it if anything appears

That you treat the centre lane as borrowed, not yours. Book 5 explains the sign is used "for three-lane sections of highway, where the centre lane is a passing lane on the two-lane section of roadway," and that its purpose is "to advise motorists travelling in the single-lane direction to exercise caution when passing because they are using a lane assigned to oncoming traffic which expects to have the right-of-way and that they must move out of the passing lane, if necessary, so as not to obstruct oncoming traffic travelling in the centre lane." The centre lane belongs to the other direction; the oncoming driver has right-of-way in it and is not expecting to negotiate. If anything appears, you abandon the pass and pull back in.

Source: MTO Driver's Handbook: Ontario Traffic Manual, Book 5 — Regulatory Signs (December 2021), YIELD CENTRE LANE TO OPPOSING TRAFFIC Sign (Rb-36)