This article is an outline of a method to approach an object of analysis as generative, compositional, and immanent to ordinary ways of living and proliferating worlds. Using the case of the American road as an emergent assemblage, I trace its singular forms and the ways in which these forms register forces of all kinds. Road registers are material-symbolic composites charged with potentiality. They form links between disparate phenomena, scales, and compositional modes from literature to state thinking, structure to fantasy. I use creative non-fiction writing as a mode of critique that can follow the lines of diverging tendencies and events in which a range of elements throw together. I present a series of snapshots of the road’s bodies and rhythms, orientations, and atmospheres. Road Registers is a middle-range concept used to rethink designations such as macro and micro, big and small, official and everyday. I elaborate affect theory’s insight that structures of living have not just effects or conditions of possibility, but also capacities to affect and to be affected, or an energetics.