As emphasized in Nagurney and Qiang (2007), the transportation network efficiency
measure given in (41) has a meaningful economic interpretation which is that the efficiency
of a transportation network is equal to the average, in terms of O/D pairs, traffic to price
ratio with the traffic per O/D pair being given by dω and the equilibrium price of travel
between O/D pair ω by λω (cf. (5) and (30)). The higher the traffic that can be handled at
a given price (which also reflects the cost and, from an engineering perspective, the travel
time), the higher the efficiency or performance of the transportation network.