Correct answer
Wet polished cobblestones.
Wet polished cobblestones can offer poorer grip than a rough, clean, dry surface. Not all paving is equally slippery, nor does every asphalt or concrete surface offer good grip: texture, water, contamination, temperature and tyres matter. Adapt speed and separation to actual road conditions.
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Rough, dry, clean asphalt.
Rough, dry, clean concrete.
Wet polished cobblestones.
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