This detour sign is rectangular rather than diamond-shaped. Why is that not a contradiction of the general temporary-condition-sign rule?

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Correct answer: D. Detour signs are a recognized rectangular exception; the orange colour still marks it as temporary

Temporary condition signs are usually diamond-shaped, but detour signs are a recognized rectangular exception — the orange background and black text still identify it as a temporary condition sign even though the shape differs from the diamond default.

Source: MTO Driver's Handbook: Signs — Temporary condition signs

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Study the rules first in the Construction & Temporary Signs guide, or browse all free G1 questions.