Annual evolution of the number of kilometres of railway lines by area. A line is a railway infrastructure that contains one or two tracks, which connects two particular places and to which a number
I rutevalgsmodeller antages det ofte, at bilister vælger rute for at minimere deres egen nyttefunktion, der f.eks. kan bestå af længde, tid og trængsel. Herved opstår den såkaldte brugerligevægt. Syst
