Correct answer
When driving through an underpass with no intention of overtaking.
In tunnels or underpasses, under Article 95.6. Because the bus exceeds 3,500 kg maximum authorised mass, at least 150 metres or six seconds applies when not intending to overtake. Clearance must also permit stopping without collision: increase it if conditions require. This does not create a 150-metre minimum on every interurban road or bus lane.
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When driving in a lane reserved for buses on a conventional road.
When driving through an underpass with no intention of overtaking.
When driving on an interurban road with one lane in each direction and with no intention of overtaking.
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