The sign you mentioned, known as "Note by verbal indication" or sign 1012-50, is used to indicate that verbal instructions will be given to drivers, usually in the context of specific traffic situations or directions provided by an authorized person. This sign is often placed in areas where temporary traffic regulations are imposed, such as during construction work or events that affect normal traffic flow.

Drivers encountering this sign should be prepared to follow the verbal instructions they receive, which may be crucial for safety and proper navigation in the area. It emphasizes the importance of paying attention to traffic controllers or police officers who may be directing traffic verbally at the time.

If you have any additional questions related to this sign or German traffic rules in general, feel free to ask!