line of tunnel

line of tunnel

[′līn əv ′tən·əl]
(engineering)
The width marked by the exterior lines or sides of a tunnel.
References in periodicals archive ?
The change in vertical displacements with varied building storey and building eccentricity, with respect to the centre line of tunnel, was assessed.
A new line of tunnel gates designed to ensure high part surface quality comes from Hasco America Inc.
We went on the bus again, and moved a small distance in front of the line of tunnels, of which are easily seen.