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For a long time limited to the study of Roman roads and their routes, archaeological research devoted to ancient road networks has entered a new era in recent decades, particularly in Brittany. The scholarly emulation of past centuries has given way to adapted and mechanized field research, allowing the multiplication of cross and longitudinal sections or large-scale excavations that have provided new and decisive information on the development or chronology of certain major road routes. Determining the recurrent presence of lanes built during the protohistoric period, previously hidden by ancient earthworks, is one example of this. It is now possible to ascertain the mutations that may have affected, from one period to another, the choice of routes, construction methods, and the ways in which the environments crossed were adapted to, as well as to measure transitional developments.