The sign "Toll-required route" indicates that drivers must pay a toll to use the road or route indicated by the sign. In Germany, certain highways and specific urban areas may require a toll for their usage, often aimed at reducing traffic congestion or funding road maintenance.

When you see this sign, be prepared to pay the required toll either at toll booths, electronically, or through a pre-paid system depending on the specifics of the toll route. Make sure to follow the signs that provide further instructions for payment methods and to keep the necessary means of payment ready.

If you have any more questions about traffic rules or need to recognize more signs, feel free to ask!