While driving a truck, when must you switch from high-beam to low-beam lights?

Explanation

Correct answer: Always when there is a possibility of blinding the driver of the vehicle in front of you.

The driver is required to switch main beams to dipped beams in any situation where they might dazzle another road user. This also applies to the driver of a preceding vehicle, who can be dazzled by the reflection of the main beams in their side and rear-view mirrors. Such dazzling poses a serious hazard to road traffic.

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