Where is this road sign installed?

1. 1Before a section of road with potholes.
2. 2Before a section of road with artificially created bumps in places where it is necessary to forcibly limit the speed of vehicles.
3. 3Before a section of road with an uneven carriageway — waviness, ridges, bulging.
4. 4Before a section of road where the shoulder is raised, lowered, or destroyed, and also where repair work is being carried out on the shoulder.