The sign you are referring to is known as "special vehicles and transport goods free" (sign number 1026-34) in Germany. This sign indicates that the area you are entering is designated for special vehicles, such as emergency services or public transportation, and that these vehicles are allowed to drive through without restrictions. Additionally, it means that transport of goods and freight in general is not permitted in this area.

In practice, this sign would typically be found near areas where the access for regular vehicles, especially those carrying goods, may be restricted to ensure the smooth operation of emergency and special vehicles. It is important for drivers to respect this sign to avoid penalties and to ensure that necessary services can operate without hindrance. If you have any further questions about traffic rules or need additional explanations, feel free to ask!