What does the left curve ahead warning sign mean?
The road curves gently to the left ahead. Adjust your speed
This sign warns of a gentle bend or curve in the road ahead: here, to the left. Adjust your speed before the curve so you can steer through it smoothly.
Why the other answers are wrong
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The road turns sharply at a right angle ahead
That is the sharp turn sign, and its arrow bends at a square corner. Check the arrow shape: a smooth, gentle bend like this one means a curve, not a sharp turn.
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A left turn is not permitted ahead
That rule would come on a white regulatory sign with a red circle and a slash. Yellow diamonds warn about the shape of the road, they never ban a turn.
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A detour goes left ahead
Detours are temporary, so they are posted on orange signs. This is a yellow warning sign, and it is telling you about the shape of the road ahead, a gentle bend to the left, not a new route to follow.
Quick way to remember
The arrow bends gently, not at a sharp angle.
Based on the official Ontario MTO Driver's Handbook.
Reading it once is not enough
Drill this question in a scored round and find out what else you are shaky on.
Practise Road Signs: Warnings
