What does this traffic sign indicate?

This traffic sign indicates a prohibition for vehicles that are wider than 2 meters, including their load. In other words, vehicles exceeding this total width are not allowed to pass where this sign is posted.

It's important to note that this restriction applies to the full width of the vehicle plus any cargo or attachments. This ensures that vehicles too wide for the road or conditions do not cause hazards or block traffic.

The red circle around the number is a common sign format in Germany that signals a restriction or prohibition, not just a warning or information. The two black arrows on the sides visually indicate the width limit.

In future, when you see a sign with a number inside a red circle and space indicators like this, it often relates to restrictions on dimensions (width, height, or length) of vehicles allowed.