Which vehicles are not allowed to use a road sign-posted like this?

The sign shown indicates that bicycles are not allowed on that particular road. In Germany, this type of prohibition is crucial for ensuring safety and managing traffic flow, especially in areas where bicycle use may conflict with motor vehicle traffic.

If bicycles are prohibited, then any options that only include bicycles are correct. If the question included other vehicles that might also be restricted, it's important to identify them correctly to ensure full compliance with road regulations.

Understanding why certain vehicles are restricted can help prevent accidents and ensure that traffic moves efficiently. Always pay attention to road signs, as they provide important information about what is allowed or prohibited.