This traffic sign is used to inform drivers that there is a stop sign ahead, located 100 meters down the road. It serves as a warning to prepare to stop and to approach the stop sign with caution. In Germany, when a stop sign is encountered, drivers are required to come to a complete stop before proceeding. This is essential for ensuring safety at intersections, as it allows drivers to check for other vehicles or pedestrians before moving forward.
Always be attentive when you see this sign, and remember the importance of stopping completely at the stop sign that follows.