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C1Difficulty 3/5

A lorry with a MAM over 3,500 kg travels through a tunnel without intending to overtake. Expressing the minimum gap to the vehicle ahead in metres, as an alternative to a minimum six-second interval, what figure applies?

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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All options

  • 150 metres.

  • 50 metres.

  • 100 metres.

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