This road sign is installed before:

• 1A section of road that has irregularities of the carriageway — waviness, ridges, buckling.
• 2A section of road with potholes or subsidence of the road surface on the carriageway.
• 3By artificially created bumps in places where it is necessary to forcibly limit the travel speed of vehicles.
• 4A section of road with bumps, ridges, or uneven joining of bridge structures.
• 5Answers 3 and 4.