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This paper proposes the concept of the virtual perimeter as an innovative approach for determining the average velocity of ventilation flow in tunnels. Average velocity is a fundamental parameter that defines volumetric and mass flow rates, energy losses, and thermal regimes. Classical methods, based on multipoint measurements with anemometers, are difficult to apply in large tunnels and, in many cases, practically impossible. The virtual perimeter identifies the zone of the tunnel’s cross-section where the loca...