Overview
- TÜV SÜD says automatic light control frequently fails to switch from daytime running lights to dipped headlights in poor visibility, reducing rear visibility to others.
- Drivers are urged to activate dipped headlights manually in fog, rain or snow because many systems only detect brightness rather than visibility conditions.
- Under StVO §17, dipped headlights are required whenever visibility is impaired, and violations can result in fines and other sanctions.
- ACE and ADAC support the warning; ADAC cites at least €60 and a Flensburg point in some cases, while another report lists lower amounts for specific lighting errors.
- Fog guidance includes using dipped headlights and fog lamps where allowed, avoiding high beam, using the rear fog light only below 50 meters with a 50 km/h limit, and keeping wipers on intermittent with blades in good condition.