Signs, markings, lights & authority

At a junction in Roosendaal you see white triangles on the road, with no sign next to them. On the crossing road a cyclist approaches from the left. What do you do?

You drive on, because without a sign next to them the triangles are not binding
You come to a full stop at the triangles, as at a stop sign, and then look
You slow down and let the cyclist go first; you stop if that is needed

Explanation

False — you think the marking needs a sign. Shark's teeth are a traffic sign in themselves: even without a sign you must give way to traffic on the crossing road, so to this cyclist too.

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