301.42 STREET OR HIGHWAY; ARTERIAL STREET.

   (a)   "Street" or "highway" are synonymous and mean the entire width between the boundary lines of every way open to the use of the public as a thoroughfare for purposes of vehicular travel.
(ORC 4511.01(BB))

   (b)   "Arterial street" means any United States or State numbered route, controlled access highway or other major radial or circumferential street or highway designated by local authorities within their respective jurisdictions as part of a major arterial system of streets or highways.
(ORC 4511.01(CCC))