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

Explanation

Correct answer: When another vehicle is approaching from the opposite direction.

The driver is required to change from main beams to dipped beams as soon as they might dazzle other drivers, particularly oncoming ones. The icons in the graphic illustrate this change: from main beams (blue symbol), which shine far and straight ahead, to dipped beams (green symbol), which illuminate the road asymmetrically and do not dazzle other road users. Failure to comply with this requirement poses a serious safety risk.

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