The sign you have indicated is a "Note by verbal indication" (1012-35). This sign is used to indicate that a person is required to announce something verbally, typically in a context where their presence or action needs to be acknowledged.

In traffic contexts, such as near construction sites or areas where work is being conducted, this sign may be used to inform drivers that they must pay attention to verbal instructions given by workers or traffic personnel.

It is important for drivers to remain alert and comply with any verbal directives to ensure safety in these areas. Always be prepared to listen to instructions when you see this sign, as it could relate to crucial information regarding the road conditions, detours, or other safety measures.

If you have any further questions about traffic rules or need more information, feel free to ask!