What do these traffic signs indicate?

The traffic sign shown indicates "No entry" 100 meters ahead. This means that drivers are prohibited from entering a restricted area for the next 100 meters. It's important to recognize this sign to avoid entering streets that may be restricted for various reasons, such as safety, traffic management, or private access. In German traffic regulations, complying with this sign is obligatory, as failing to do so can lead to legal penalties, accidents, or disruption of traffic flow.

In this case, understanding the distance indicated on the sign is crucial for planning your driving route appropriately.