The sign you referred to is the Announcement or Continuation of the Diversion Without Arrow Symbol Execution According to RUB (Richtlinien für die Einrichtung und den Betrieb von Verkehrszeichen und Verkehrseinrichtungen). This traffic sign indicates that a diversion is in place and provides information about changes to the traffic route due to road work, accidents, or other obstructions.

When you see this sign, it generally means that you should expect a change in the typical traffic flow and may need to follow alternative routes. The absence of an arrow suggests that the diversion might not have a specific direction or that it is applicable to multiple lanes or roads.

Drivers should remain attentive and comply with any additional signs or instructions that accompany this announcement to navigate safely through the area affected by the diversion. Always drive cautiously in such situations and follow the rules and regulations to avoid accidents.

If you have more questions about traffic rules or related topics, feel free to ask!