I try to create a road graph "test" from the layer "Route" of the BD Topo IGN. To generate a graph with Network Analyst, it is asked to create and to inform certain number of fields, bans to calibrate the graph (oneway, FT Minutes, TF Minutes).
Still having never to create of graph, I would like knowing how to determine the values by section for fields FT Minutes and TF Minutes. It's well these fields which allow to affect a time of route by section following the speed? If I understood well, FT and TF is the extremities of my sections.
I found an example of calculation: Minutes_ft = (longueur_tronçon / 2/1000 / [speed] 60), this calculation is it correct?
I'm not sure I completely understand your question. But I think you want help to get started creating network datasets and calculating a time-cost network attribute. If so, it may help if you watch the videos in the following series, especially videos 1 and 2.