The sign you are referring to is known as "Announcement or continuation of the detour straight ahead." This traffic sign indicates that drivers should follow a detour or diversion that is straight ahead. It is typically used when there is construction or road work that necessitates a change in the usual route.

This sign serves to inform drivers that they must continue on a specific detour instead of entering the blocked or restricted area. It typically includes a numbering system which may relate to a specific detour route for clarity.

When you see this sign, make sure to adhere to it and follow the indicated route to ensure safety and compliance with the regulations.