Where is this road sign installed?

• 1Before a section of road with potholes.
• 2Before a section of road with artificially created bumps in places where it is necessary to forcibly limit the speed of vehicles.
• 3Before a section of road with an uneven carriageway — waviness, ridges, bulging.
• 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.