What does this traffic sign combination indicate?

The red triangular sign with an exclamation mark is a general warning sign in German traffic rules. When combined with the supplementary sign showing a horse and carriage, it specifically warns drivers of a potential danger involving horse-drawn vehicles in the area.

This sign does not mean that horse carriages have priority or that they are prohibited. Instead, it alerts you to be cautious because horse-drawn vehicles may be slower, less maneuverable, or unpredictable, so you should drive carefully and be prepared to adjust your speed or stop if necessary.

Understanding this warning helps ensure the safety of all road users, especially when encountering horse-drawn vehicles, which require increased attention and patience from motor vehicle drivers.