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The vertical sign indicates the proximity of a section of road with:

ACongestion.
BLow verges and risk of overturning.
CRoad obstruction.Correct
Explanation
The vertical danger sign shown is sign A31, which indicates the proximity of a road section where traffic is obstructed by vehicles. Upon seeing this sign, the driver must moderate their speed and prepare for a possible stop. The other options are incorrect because traffic congestion is indicated by another specific sign with three vehicles in a row, and there is no danger signage with this symbol to indicate low verges.
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