Correct answer
When it leaves less than 3 metres of clearance or prevents other vehicles passing.
When less than 3 metres remain between the vehicle and the opposite carriageway edge or a longitudinal marking that must not be crossed, or when other vehicles cannot pass. More than 3 metres alone does not guarantee legal parking: other danger or obstruction provisions apply, including accesses and properly marked vehicle entrances. This question specifically concerns available clearance.
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Only when it leaves more than 3 metres and does not prevent passage.
Only if the lorry exceeds 7.5 tonnes MAM.
When it leaves less than 3 metres of clearance or prevents other vehicles passing.
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