The sign "Warnings of hazards by verbal indication 1007-38" is used in Germany to alert drivers to potential dangers that are not represented by a specific graphic sign. This sign typically conveys important information verbally through an announcement system about hazards that may be present on the road ahead.

In practice, it may be used in areas where there are temporary or changing conditions, such as construction zones, accidents, or severe weather, effectively communicating the nature of the hazard. It's essential for drivers to pay attention and heed these verbal warnings to ensure their safety and the safety of others on the road.

If you have further questions about this sign or any other traffic rules, feel free to ask!