Correct answer
To adapt traffic regulation to changing conditions.
To regulate traffic according to changing conditions, under article 142. It may provide information, warn of hazards, recommend actions or issue binding instructions. Its messages are not all mere advice. Its changes to normal arrangements end as specified by the signage or when their causes cease. Road delineation and vehicle restraint systems have their own functions; they are not simply two types of temporary messages.
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To adapt traffic regulation to changing conditions.
To give only recommendations that are never binding.
Always to prevent any change to normal traffic arrangements.
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