When driving a bus with a maximum authorized mass (MAM) above 3,500 kg through a tunnel with no intention of overtaking, what minimum safety distance must be kept from the vehicle ahead?

Question

DentroTest · Accepted Answer

The General Traffic Regulations (Article 95(6)) set the safety distance in tunnels and underpasses when there is no intention to overtake: Vehicles with a maximum authorized mass (MAM) of more than 3,500 kg (such as this bus): at least 150 meters or a minimum interval of 6 seconds. Their greater mass means a longer braking distance and more risk in an emergency or fire in a confined space. All other vehicles (up to 3,500 kg MAM): at least 100 meters or a minimum interval of 4 seconds. That figure does not apply to this bus. The 50 meters is the general minimum separation for heavy vehicles on open roads (Article 54(2)), insufficient in a tunnel, where 150 meters or 6 seconds are required.

When driving a bus with a maximum authorized mass (MAM) above 3,500 kg through a tunnel with no intention of overtaking, what minimum safety distance must be kept from the vehicle ahead?

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