What does this traffic sign indicate?

This traffic sign indicates a mandatory cycle path. It is specifically designed to inform cyclists that they must use the designated bike lane, ensuring safety and smooth traffic flow. According to German traffic regulations, cyclists are required to utilize such paths whenever they are available. Failure to do so can result in penalties for cyclists, as it not only promotes safety but also helps in organizing road usage efficiently. The sign is important for both cyclists and motorists, as it clarifies where cyclists are expected to ride, reducing the risk of accidents.