When driving inside a tunnel with no intention of overtaking, what minimum safety distance must be kept from the vehicle ahead if you are driving a bus with a maximum authorized mass (MAM) of 18,000 kg?

Question

DentroTest · Accepted Answer

Inside tunnels and underpasses, when there is no intention of overtaking, traffic regulations impose reinforced safety distances to avoid rear-end collisions and ease evacuations in the event of a fire or breakdown. For heavy vehicles whose maximum authorized mass (MAM) exceeds 3,500 kg, such as this 18,000 kg bus, the mandatory minimum distance from the vehicle ahead is at least 150 meters or a time interval equivalent to 6 seconds. The distance of 100 meters or 4 seconds applies exclusively to vehicles of up to 3,500 kg of MAM.

When driving inside a tunnel with no intention of overtaking, what minimum safety distance must be kept from the vehicle ahead if you are driving a bus with a maximum authorized mass (MAM) of 18,000 kg?

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