When driving inside a tunnel at the wheel of a truck with a maximum authorized mass (MAM) above 3,500 kg, what is the minimum safety time interval you must keep from the vehicle ahead if you are not going to overtake it?

Question

DentroTest · Accepted Answer

The General Traffic Regulations establish specific rules for driving in tunnels and underpasses in order to avoid chain collisions and facilitate evacuation in the event of an emergency or fire. When there is no intention to overtake, drivers of vehicles with a maximum authorized mass (MAM) above 3,500 kg must keep a safety distance of at least 150 meters or a time interval of no less than six seconds from the vehicle ahead. By contrast, for vehicles of up to 3,500 kg MAM, this requirement is reduced to 100 meters or four seconds.

When driving inside a tunnel at the wheel of a truck with a maximum authorized mass (MAM) above 3,500 kg, what is the minimum safety time interval you must keep from the vehicle ahead if you are not going to overtake it?

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