What is the driver's statutory duty under StVO § 92 when leaving a muddy agricultural field and entering a paved public road?

1. Reduce speed to 25 km/h so the mud does not spread as far
2. Switch on the amber beacon and continue; cleaning the road is the road authority's task
3. Clean excess mud, manure and soil off the tyres and bodywork before driving onto the asphalt, so the carriageway is not soiled and made slippery
4. Clean the road only where the soiling extends over more than 100 metres