You are driving with main beam lights on in darkness. When do you have to dip your headlights?

You answered correctly. When driving with your main beam (high beam) lights at night, you must dip your headlights to avoid dazzling other road users. This is necessary both when an oncoming vehicle approaches and when you are driving close behind another vehicle. In both cases, your high beam could impair the other driver’s vision. However, there is no requirement to dip your headlights for pedestrians walking in the same direction ahead of you, unless they could be dazzled, which is unusual. Knowing when to switch from high beam to low beam is important for safety and considerate driving in Germany.