What does this traffic sign indicate?

This traffic sign indicates a prohibition specifically for motor vehicles that carry dangerous goods and must display mandatory hazard markings. In Germany, such vehicles are required to have orange hazard placards showing they transport hazardous materials. This sign means these vehicles are not allowed to enter or drive in the area where the sign is posted.

The red circle signifies a general prohibition, and the orange panel with the axles symbolizes hazardous material transport vehicles. This restriction is important for safety reasons, protecting certain areas from potential risks related to dangerous goods.

The other options, such as prohibiting vehicles with an axle weight over 3.5 tons or trucks and combinations, are indicated by different signs, so they do not apply here. Understanding this sign helps ensure that drivers of hazardous goods comply with specific route restrictions to maintain safety on the roads.