Can you dazzle vehicles travelling ahead of you in the same lane with full-beam headlights?

Correct answer

Yes, through their rear-view mirrors, so you must switch to dipped headlights.

It is possible to dazzle vehicles travelling ahead in the same lane by using full-beam headlights, especially through their rear-view mirrors. Therefore, it is important to switch to dipped headlights in these situations. During overtaking: if you are overtaking another vehicle, you must avoid using full-beam headlights until you are alongside the vehicle being overtaken. This prevents dazzling its driver through the rear-view mirrors. Switching to dipped headlights: once you are alongside the other vehicle, or if you are behind another vehicle in the same lane, you must use dipped headlights to avoid dazzling. On bends: if you are on a bend, especially a right-hand bend, and there are vehicles travelling in the opposite direction, switch to dipped headlights early to avoid dazzling them. If the bend is to the left, dazzling is less likely, but it is still important to consider other drivers.