When driving inside a tunnel or underpass with no intention of overtaking, what safety distance must a vehicle with a maximum authorized mass (MAM) above 3,500 kg keep from the one ahead?

Question

DentroTest · Accepted Answer

In tunnels and underpasses, the General Traffic Regulations set strict minimum distances to avoid accidents and ensure evacuation in an emergency. For most light vehicles, the regulatory distance when there is no intention of overtaking is at least 100 meters or 4 seconds. However, for heavy vehicles with a maximum authorized mass (MAM) of more than 3,500 kg, that separation is required to be increased to a minimum of 150 meters or a time gap equivalent to 6 seconds. The generic rule of keeping only the distance needed to avoid a collision is not sufficient in these enclosed sections.

When driving inside a tunnel or underpass with no intention of overtaking, what safety distance must a vehicle with a maximum authorized mass (MAM) above 3,500 kg keep from the one ahead?

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