The sign "Water protection area" indicates that you are entering a zone designated to protect the local water supply and aquatic environments. In Germany, these areas are established to prevent contamination and preserve the quality of water resources.

When driving through a water protection area, certain restrictions may apply, such as limitations on the use of fertilizers, pesticides, and other potentially harmful substances. It is also advised to avoid activities that could lead to pollution, which includes improper waste disposal.

Drivers are encouraged to be mindful of their actions in these areas to help maintain environmental safety. It's important to follow any additional local regulations or signs that may provide more specific instructions related to the water protection area.