Correct answer
The distance that allows you to stop the bus, in the event of sudden braking by the vehicle in front, without colliding with it.
Leave enough space to stop without collision if the vehicle ahead brakes suddenly, considering speed, grip and braking capability. The additional overtaking gap is not required here because there is more than one lane in the same direction, under Article 54.3.c. There is no single 50-metre or four-second figure for every situation; tunnels and underpasses have specific rules.
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50 metres, as a minimum.
The distance that allows you to stop the bus, in the event of sudden braking by the vehicle in front, without colliding with it.
The equivalent of a minimum safety interval of 4 seconds.
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