Panneaux routiers

Which sign most commonly indicates that a road is one-way?

Panneau routier de Ontario — A horizontal rectangle with a large directional arrow
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Bonne réponse : B. A horizontal rectangle with a large directional arrow

The one-way arrow sign is a horizontal black rectangle with a white arrow. Recognising this shape-and-colour combination at a glance is essential in urban grids where one-way streets are common and entering the wrong way can cause head-on collisions.