What motor vehicles are prohibited from driving on a road where this sign is displayed?

The sign displayed is a prohibition sign specifically for certain motor vehicles, primarily focusing on agricultural machinery and vehicles that have speed restrictions. According to German traffic regulations, this sign restricts the following:

1. Tractors with a type-specific maximum speed of 25 km/h: These vehicles are generally slower and can impede traffic flow, which is why they are prohibited on certain roads.

2. Motor vehicles with trailers that have a maximum permissible speed of 25 km/h: Similar to tractors, these vehicles are also slower and can cause hazards or delays on roads designed for faster traffic.

The prohibition does not apply to tractors with a type-specific maximum speed in excess of 40 km/h, as these are typically able to keep up with regular traffic speeds and are therefore allowed on these roads.

Understanding this regulation is important for safe and efficient traffic management, ensuring that slower vehicles do not obstruct faster ones on roads where higher speeds are expected.