The sign in the image indicates the possible presence of speed controls on that stretch...
Signage: Vertical signs
This S-991g sign indicates exclusively that there may be **speed** checks carried out from the air (helicopters or drones), not lateral clearance checks or other types of enforcement.
Explanation
Speed control by aerial means (S-991g)
This sign indicates that, on that road section, **speed checks may be carried out from the air**, for example using **helicopters** or **drones**.
If the speed check is aimed only at a **specific type of vehicle** (for example, only lorries or only motorcycles), the sign may show **only the pictogram** corresponding to that vehicle.
Its purpose is to **warn the driver** that compliance with **speed limits** is being monitored by **aerial means**, even if these are not visible from the road.
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