A transport network, or transportation network in American English, is typically a network of roads, streets, pipes, aqueducts, power lines, or nearly any structure which permits either vehicular movement or flow of some commodity.
A transport network is used for transport network analysis to determine the flow of vehicles (or people) through it within the field of transport engineering, typically using mathematical graph theory. It may combine different modes of transport, for example, walking and car to model multi-modal journeys.