Panneaux routiers

A yellow diamond showing a downhill slope with a percentage number on an NWT road means:

Panneau routier de Territoires du Nord-Ouest — Steep downgrade — check brakes, use lower gear for engine braking
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Bonne réponse : A. Steep downgrade — check brakes, use lower gear for engine braking

Riding the brakes down long grades causes fade; engine braking preserves stopping power for emergencies.