Correct answer
When the trailer’s MAM exceeds 3,500 kg.
When the trailer’s MAM exceeds 3,500 kg. The figure refers to trailer MAM, not its actual mass at that moment or the combination’s total mass. Exactly 3,500 kg does not exceed the limit. R-112 includes exceptions for semi-trailers and single-axle trailers; this question specifies a two-axle trailer. Travelling unladen does not remove a prohibition based on MAM.
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When the trailer’s MAM exceeds 3,500 kg.
When the trailer’s MAM is exactly 3,500 kg.
Whenever the combination’s laden mass exceeds 3,500 kg.
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Sign R-112: no entry for motor vehicles with a trailer other than a semi-trailer or a single-axle trailer
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