What does this traffic sign warn you of?

The traffic sign you provided indicates a danger of skidding. It's particularly relevant under two conditions: when the roadway is dirty and when it is wet.

German traffic regulations emphasize safety under varying road conditions. When the road is dirty, such as after gravel or debris is present, or when it is wet from rain, the risk of losing traction increases. The warning is crucial because it alerts drivers to reduce speed and drive cautiously to prevent accidents caused by skidding.

Selecting both options is important for a comprehensive understanding of the risks associated with different road surface conditions. Recognizing these scenarios helps ensure safer driving practices and enhances overall road safety.