The sign you're referring to is a "Guide Post Warning Light Post – Installation on the Right." This sign indicates that a guide post with a warning light is installed on the right side of the road. Such installations are often used to provide additional visibility and guidance, particularly in areas where road conditions may change, such as near construction zones or at complex intersections.

In Germany, these signs are important for ensuring safety as they inform drivers to be cautious and observe any changes in road conditions or regulations. It is essential to pay attention to these signs because they can help prevent accidents, especially in low visibility conditions or in areas where there may be unexpected obstacles or hazards.

Always remember to adjust your driving accordingly when you see such signs to maintain safety for yourself and others on the road. If you have any further questions about specific driving rules or other signs, feel free to ask!