The files containing the drayage instances (Crane100xxx and Crane300xxx) have the following format: NOMBRE: <name of the instance> COMENTARIO: <comment> VERTICES: <number of vertices> ARCOS_REQ: <number of required arcs> ARCOS_NOREQ: <number of non-required arcs> VERTICES_REQ: 0 LIST OF REQUIRED ARCS: (<u1>,<u2>) coste <c> . . . LIST OF NO REQUIRED ARCS: (<u1>,<u2>) coste <c> -1 . . . Cordenadas vertices <v1> (<x1>,<y1>) <v2> (<x2>,<y2>) . . . Entries <name of instance> and <comment> may be empty. For each required arc from node u1 to node u2 there is a line (<u1>,<u2>) coste <c> where c is the cost of traversing the arc. For each non-required arc from node u1 to node u2 there is a line (<u1>,<u2>) coste <c> -1 where c is the cost of traversing the arc. There are no required vertices in these instances. The coordinates of the vertices are given at the end of the file as: <v1> (<x1>,<y1>) where <v1> is the number of the vertex and <x1> and <y1> its coordinates. The files containing the SCP grid instances (Crane_gridxxx) have a similar format. All the vertices not incident with a required arc are non-required vertices. NAME: <name of the instance> Arcos no requeridos finales: <number of total non-required arcs> VERTICES: <number of vertices> ARCOS_REQ: <number of required arcs> ARCOS_NOREQ: <number of lines containing the non-required arcs> VERTICES_REQ: 0 LIST OF REQUIRED ARCS: (<u1>,<u2>) coste <c> . . . LIST OF NO REQUIRED ARCS : (<u1>,<u2>) coste <c1> <c2> . . . VERTICES REQUE: The line "Arcos no requeridos finales" gives the total number of non-required arcs of the graph, while the line "ARCOS_NOREQ:" gives the total number of lines in which the non-required arcs are given (since some non-required arcs exist in both directions, this number may be smaller than the total number of arcs). For each required arc from node u1 to node u2 there is a line (<u1>,<u2>) coste <c> where c is the cost of traversing the arc. For each non-required arc from node u1 to node u2 there is a line (<u1>,<u2>) coste <c1> <c2> where c1 is the cost of traversing the arc from u1 to u2, and c2 is the cost of traversing it from u2 to u1, or -1 if such arc does not exist.