What does this traffic sign indicate?

This traffic sign is a distance marker for a level crossing. It indicates that the level crossing is approximately 80 meters ahead. In Germany, these markers help drivers judge how close they are to a railroad crossing so they can prepare to stop if necessary.

The single red diagonal stripe on a white rectangular sign means 80 meters distance. Two stripes would indicate 160 meters, and three stripes would indicate 240 meters. Recognizing these markers helps ensure you reduce speed and pay attention as you approach the crossing for safety.