It is owned and operated by West Nippon Expressway Company.

The expressway is officially referred to as the Chūgoku-Ōdan Expressway Hiroshima Hamada Route.

The Chūgoku-Ōdan Expressway Hiroshima Hamada Route is the official designation for the Sanyō Expressway between Hiroshima Interchange and Hiroshima Junction, the Hiroshima Expressway between Hiroshima Junction and Hiroshima-kita Junction, the Chūgoku Expressway between Hiroshima-kita Junction and Chiyoda Junction, and the Hamada Expressway between Chiyoda Junction and Hamada Interchange (concurrent with the Chūgoku-Ōdan Expressway Hiroshima Hamada Route).

Although the route officially originates at Hiroshima Junction, the southern terminus and terminates at Hiroshima-kita Junction, the northern terminus, exit numbers and kilometer markings originate from Hiroshima-kita Junction.

This article relating to the roads and highways in Japan is a stub.