The sign you are referring to is called "End of a detour" (Umleitungsende). This traffic sign indicates that the road you are on is no longer subjected to a detour, and normal traffic conditions resume.

When drivers see this sign, it means that any temporary restrictions or changes in the traffic flow due to roadworks or other diversions are now ended. You can expect to find standard traffic rules applying ahead, and you should resume your usual driving behavior.

If there are any additional questions you have about the rules or situations related to driving in Germany, feel free to ask!