Ontario road sign practice question ON-1360: What does this sign warn you about?

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A yellow diamond sign with a black edge, showing a black truck on the right facing left, with two vertical black lines (one solid, one broken) to its left, small black dashes trailing behind the truck and short black brackets above and below it.

What does this sign warn you about?

Manual basis

MTO Driver’s Handbook: Traffic Signs and Lights, Warning signs

Concepts this question tests

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