Panneaux routiers

A yellow diamond warning sign showing one lane narrowing into the other means:

Panneau routier de Ontario — The lane you are in will end — merge into the continuing lane
Afficher la réponse et l'explication
Bonne réponse : A. The lane you are in will end — merge into the continuing lane

A lane-ending sign tells you to merge into the remaining lane before your lane runs out. Signal early, check the mirror and blind spot, and match the speed of the through lane. Last-moment forced merges are a frequent cause of sideswipe collisions.