Correct answer
When cold.
A vehicle’s tyre inflation pressure must be checked when the tyres are cold. This means that the measurement must be taken before the vehicle has been driven or at least several hours after it has been used. The reason is that when tyres heat up through driving, their pressure temporarily increases, which may give an inaccurate reading if measured in that condition.
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When hot.
When cold.
It does not matter whether they are cold or hot.
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