Correct answer
4 metres.
Four metres under Annex IX, section 3, of the General Vehicle Regulations. Specific cases have other heights, including certain urban buses and vehicles expressly listed in that annex; the question asks for the general rule. This maximum does not authorise passing under a lower obstruction or ignoring a signposted restriction. Check the actual height of the vehicle and load.
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4 metres.
3 metres.
4.5 metres as the general rule for all vehicles.
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