Transit time constrained Canad instances

Transit time constrained adaptations of the Canad instances by A. Frangioni (2012), used in the paper " On Transit Time Constrained Fixed Charge Multi-commodity Flow Problems". Each instance starts with three numbers (N,A,K), representing the number of nodes, arcs and commodities in the instance, respectively. Then follows A lines describing the arcs and K lines describing the commodities. The lines for arcs contain 6 numbers representing, in order: the start node, the end node, the unit flow cost, the capacity, the fixed charge, and the sail time. The lines for commodities contain 4 lines: the start node, the end node, quantity and the transit time. Transit times are at a base level and should be scaled up depending on how tight time constraints one wants. In the paper, mostly a factor of 1.2 was used. The original instances can be found at: http://groups.di.unipi.it/optimize/Data/MMCF.html [25 sep 2020]