Yes, state sign regulations apply to all state and federal highways, regardless of whether the sign is inside or outside the limits of a city.
Some permit requirements change within a city. For example, the law requires more distance between signs outside city limits, than within.
In addition, sometimes the state transfer a state highway to a county or city jurisdiction. In some cases, federal law requires us to continue regulating signs there. Check with us if you have a question about the location.
Occasionally the state transfers ownership of a highway to a county or city jurisdiction. In certain circumstances, federal law requires ODOT to continue it responsibilities to regulation the signs on that roadway.