What does this traffic sign indicate?

You chose the correct answer. This traffic sign warns of a moveable or opening bridge ahead. In Germany, it means you should be prepared to stop, as the bridge could be open to let ships pass. It's important not to confuse this with signs for a ferry or roadworks; the key feature is the symbol showing the bridge raised and water underneath. When you see this sign, approach carefully and look out for barriers or signals that control the crossing.