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

The sign depicts a prohibition specifically aimed at certain types of vehicles, particularly tractors and motor vehicles with trailers that are restricted based on their speed capabilities. According to German traffic rules:

1. Tractors with a type-specific maximum speed of 25 km/h are prohibited from driving on roads where this sign is displayed.
2. Motor vehicles with trailers that also have a maximum permissible speed of 25 km/h are similarly restricted.

These regulations are in place to ensure safety and regulate traffic flow, preventing slower-moving vehicles from interfering with faster traffic on particular roads. The combination of these specific vehicles is important to recognize because it helps maintain order and predictability on the road, reducing the risk of accidents.