Correct answer
150 metres.
Vehicles with a MAM over 3,500 kg must leave at least 150 metres or a minimum six-second interval. For other vehicles, including exactly 3,500 kg, it is at least 100 metres or four seconds. Also maintain the gap needed to stop safely for speed, grip and conditions, and obey tunnel instructions.
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150 metres.
50 metres.
100 metres.
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