What do these traffic signs indicate?

The traffic signs in the image indicate a restriction on overtaking. Specifically, the upper sign shows a no-overtaking symbol, meaning that overtaking other vehicles is prohibited. The bottom sign indicates that this restriction applies for a distance of 3 kilometers.

In German traffic regulations, this combination reinforces the importance of safety on certain road sections where overtaking could pose risks, such as curves, intersections, or reduced visibility. Drivers must adhere to this rule to maintain safe traffic flow and reduce accidents.