The sign name is Warnings of hazards through verbal indication 1007-51. This sign indicates that there are verbal warnings about potential hazards ahead. It is usually used in situations where there may be temporary changes in traffic conditions or to alert drivers about particular dangers that might not be visually obvious.

For example, it might be employed in roadworks areas, to inform drivers to stay vigilant due to workers or machinery on or near the road, or in emergency situations where extra caution is required.

Drivers should pay close attention to verbal warnings as they provide critical information that can help ensure safety. It's important to always remain alert for any indications to adjust your driving behavior accordingly, such as reducing speed or being prepared to stop if necessary.