Correct answer
70 metres minimum, except when overtaking.
Keep a gap of at least 70 metres, except when carrying out the overtaking manoeuvre. A safe gap is still mandatory during that manoeuvre. The exception does not permit dangerously close following or overtaking prohibited by another rule or sign.
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70 metres maximum.
70 metres minimum, except when overtaking.
70 metres minimum, in any case.
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