What does this traffic sign indicate?

This traffic sign indicates the end of the autobahn. In Germany, this sign is used to inform drivers that they are leaving the specific high-speed motorway regulations and conditions that apply on the autobahn.

Understanding this sign is essential because it signifies that drivers should prepare to reduce their speed and be mindful of different traffic rules that may apply on regular roads, including speed limits and increased interactions with other vehicles. It also indicates the transition from a high-speed environment to potentially more congested urban or rural roads. Always ensuring full awareness of the road signs and their meanings helps promote road safety and compliance with traffic laws.