This road sign is installed before sections of road on which:

1. 1The shoulder is raised, lowered, or destroyed, or repair work is being carried out on the shoulder.
2. 2Ejection of gravel, crushed stone, etc. from under the wheels of vehicles is possible.
3. 3Road work is being carried out.
4. 4There are carriageway irregularities - waviness, ridges, heaving.