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DDifficulty 3/5

A bus with a maximum authorised mass of 18,000 kg travels through a tunnel without intending to overtake. Under Article 95.6, what minimum distance or time gap must it keep behind the vehicle ahead?

Correct answer

150 metres or a minimum interval of 6 seconds.

At least 150 metres or a minimum six-second gap because its maximum authorised mass exceeds 3,500 kg. This is a regulatory minimum. Increase it if conditions require more space for safe travel. Do not confuse it with the general 100-metre or four-second gap for vehicles not exceeding that mass threshold.

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  • 200 metres or a minimum interval of 8 seconds.

  • 150 metres or a minimum interval of 6 seconds.

  • 100 metres or a minimum interval of 4 seconds.

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