2 ptsD,D1Official number: 6894
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 beam headlights to dipped beam headlights if they may dazzle the driver of a preceding vehicle. Main beam headlights reflected in the mirrors of the vehicle in front can cause disorientation and create a hazard on the road. The graphic shows this required action: changing from main beam headlights (symbol on the left) to dipped beam headlights (symbol on the right).