Correct answer
When the panel of the mountain pass transitability sign is red.
Red: the maximum is 30 km/h, and suitable chains or special tyres are required. Black means closure, so having chains does not permit travel. Restrictions on lorries, articulated vehicles and buses have an exceptional-passage regime under DGT requirements and notifications; equipment alone does not automatically authorise any vehicle. Always obey officers’ instructions and current restrictions.
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When the panel of the mountain pass transitability sign is yellow.
When the panel of the mountain pass transitability sign is red.
When the panel of the mountain pass transitability sign is black.
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