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

The sign in the image indicates a prohibition for certain vehicles. In this case, it specifically prohibits cars from using that road.

According to German traffic regulations, this kind of signage is used to restrict access to specific types of vehicles, particularly in areas where traffic control measures are necessary due to safety, environmental concerns, or to reduce congestion.

Your previous answer identified the vehicles that are not allowed correctly, aligning with the rule that prohibits specific vehicle types, such as trucks, but more importantly, it emphasizes that cars must also adhere to the restriction displayed by the sign. Understanding the complete implications of such signs is crucial for safe and lawful driving. Always ensure to fully recognize the restrictions indicated by traffic signs to comply with the law effectively.