The road sign for the highway, commonly referred to as the "Autobahn" sign in Germany, is a blue rectangular sign with a white depiction of a highway. This sign indicates that you are entering a section of the roadway designated for high-speed traffic, specifically on the autobahn.

Key points about the autobahn sign:

1. **Highway Regulations**: When you see this sign, it means you are entering a highway where higher speed limits apply. Most sections of the autobahn do not have a specific speed limit, but there is a guideline to drive at a speed of at least 60 km/h.

2. **Driving Rules**: On the autobahn, certain rules must be followed:
- Slow-moving vehicles should stay in the right lane.
- Overtaking is typically done in the left lane.
- Ensure your vehicle is in good condition to handle high speeds.

3. **Safety Measures**: Always be mindful of the traffic around you, maintain a safe following distance, and be prepared for sudden changes in traffic flow.

Understanding this sign is crucial for safe driving on Germany's highways. If you have any specific questions about driving rules related to the autobahn or anything else, feel free to ask!