Correct answer
Where the road surface can be particularly slippery due to ice or snow.
The vertical danger warning sign P-34 indicates the proximity of a stretch of road with a surface that is slippery due to snow or ice, where we should reduce speed and take extra care to prevent our vehicle's wheels from skidding on that road.
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With loss of visibility due to fog, rain, snow, smoke, etc…
Where rockfalls are frequent.
Where the road surface can be particularly slippery due to ice or snow.
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