Hazard warning: shows where the road separates ahead

Where you will see it

Where one road becomes two, with the carriageways parted by an island or a median strip.

What to do

Keep left into the carriageway meant for your direction, and choose it before the split rather than at it. Once you are on it, everything on the far side of the island is coming the other way, so nothing over there is a lane you can use.