Panneaux routiers

A yellow diamond warning sign showing two arrows joining from either side into one lane indicates:

Panneau routier de Ontario — Merging traffic ahead
Afficher la réponse et l'explication
Bonne réponse : B. Merging traffic ahead

The merging sign warns that another lane will join yours ahead. Drivers in the continuing lane should prepare to let merging traffic in, and drivers on the merging side should match speed before entering. This prevents the collisions common at poorly-timed merges.