Prohibitory signs
Prohibition sign - a sign prohibiting behaviour likely to increase or cause danger (eg no smoking)
Intrinsic features:
- round shape
- black pictogram on white background, red edging and diagonal line (the red part to take up at least 35% of the area of the sign)
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No smoking
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Naked flames forbidden
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No access for pedestrians
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Do not extinguish with water
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No access for unauthorised persons
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No access for industrial vehicles
