The sign you are referring to is the Notice Board (Hinweistafel) as per the regulations of the German Road Traffic Law (StVO).

This traffic sign is used to provide important information to drivers regarding specific conditions or obligations in a certain area. It often displays instructions or warnings related to road use, such as speed limits, construction areas, or other temporary traffic regulations.

Drivers should pay careful attention to these notice boards as they can indicate changes in traffic rules or inform about upcoming hazards. Ignoring the information provided by this sign can lead to traffic violations or safety risks.

If you have any further questions or need explanations about specific aspects of the traffic rules, feel free to ask!