What vehicles may enter a cycle highway that has this sign?

This sign combination shows a "Fahrradstraße" (cycle street) with an additional sign "Anlieger frei" (residents/authorized persons allowed). On these roads, only bicycles and E-bikes are generally permitted, but the additional sign makes an exception for residents or people who have a specific reason to enter (for example, people who live, work, or have business on that street). Other vehicles, like mopeds or cars, are not allowed unless they are being driven by these authorized persons. This prioritizes cyclists and reduces through traffic, making the street safer and quieter for bikes. Your selected answer is correct: only vehicles driven by residents or similar authorized persons may enter.