You are driving a motor vehicle with a manual gearbox. What is the correct thing to do when you see this traffic sign?

This traffic sign warns of a steep downhill gradient of 12%. When you see this sign while driving a vehicle with a manual gearbox, you should shift to a lower gear if necessary. This increases engine braking, helping you keep your speed under control and reducing the risk of overheating your brakes on the descent. Choosing a lower gear is the correct and safe response in such situations, which is why your answer is correct. Always avoid shifting to a higher gear when going downhill, as this reduces the braking effect of the engine.