Ce texte fait partie d'un dossier dirigé par Sandrine Robert et Nicolas Verdier, intitulé "Du sentier à la route. une archéologie des réseaux viaires"National audienceThe question of “ double ways ”, ' "Éffilochage" or "chevelu" of ways, or even "lability" network is the one who is going to occupy us in this article. To try to notice in the best these fluctuations of the system of terrestrial communication, we shall cross two bases, the first one relating to the roads of Post office from 1700s till 1830, what corresponds carrying on thank you localities of more than 4000 inhabitants during the same period. These localities which we shall call here, without discussing it, cities, seem to be able to be, more and more considered as being point...