The sign you mentioned is known as "Multi-lane vehicles allowed" (sign 1024-10). This traffic sign indicates that vehicles with multiple lanes are permitted to travel on the road.

In Germany, this sign is typically displayed to inform drivers that they can expect multi-lane traffic on the upcoming road section. It can be particularly helpful in areas where lane restrictions might apply to specific vehicle types or when approaching sections of a roadway that widen to allow more traffic.

When you see this sign, it means you can drive normally without worrying about being restricted to a single lane. However, always ensure to remain aware of other road users and any additional traffic signs that might provide further instructions or restrictions as you drive.

If you have any further questions about German traffic rules or need assistance with other signs, feel free to ask!