If geographers wanted to study transportation, the most useful concept would likely be movement. Movement refers to the flow of people, goods, and services from one location to another and encompasses various transportation modes and routes. Understanding movement allows geographers to analyze patterns, trends, and the effectiveness of transportation systems, as well as its impact on economies and societies.
While relative location, absolute location, and human-environment interaction can also play important roles in a geographical study, movement is most directly related to the dynamics of transportation.