Official maps distinguish United States Highways 183, 270, and 412, State Highways 15 and 34, City streets, County corridors, commercial entrances, and private access. Route placement does not establish maintenance.
Keep the mile or coordinates, direction, lane, intersection, entrance, traffic controls, construction signs, surface, vehicle positions, and crash date. A maintenance office, project, regulator record, or energy-site label does not prove control or involvement.
Trip records may belong to different organizations. Preserve every legal name and identifier before records are overwritten or equipment changes.