What does this traffic sign indicate?

The traffic sign you see indicates the start of an autobahn, which is a high-speed highway in Germany. Upon seeing this sign, drivers know they are allowed to enter a specific stretch of road designed for efficient and fast travel, usually without specific speed limits.

Autobahn regulations include, but are not limited to, the requirement for vehicles to be capable of maintaining a minimum speed and to follow certain safety and lane discipline rules. Understanding this sign is essential for safe driving and ensuring compliance with road regulations.