Ever since they were first proposed by French toller Cofiroute some (including us) have worried that their low overhead tunnelways (2.57m, 8.4ft, 101 inches) would seem claustrophic and deter customers. The low height is key to the economy of having two levels of roadway and both directions of traffic in the one tunnel tube, and to making the A86 tunnelway project financeable with tolls. Join discussion...