When do you have to switch on your dipped headlights?

The combination of choices 1, 2, and 3 is correct because German traffic regulations require drivers to switch on dipped headlights in several specific situations to ensure safety.

1. During twilight: Dipped headlights are necessary to improve visibility as natural light fades, making it harder for others to see your vehicle.
2. When it is dark: The use of headlights is crucial after sunset or during periods of low visibility to help you see the road and be seen by other road users.
3. When driving through a tunnel: Inside tunnels, even in daylight, it is required to use dipped headlights for safety reasons, as the artificial lighting can create sharp contrasts and reduce visibility.

It's important to remember these rules not only to comply with traffic laws but also to enhance overall road safety for yourself and other drivers.