It is owned and operated partly by the West Nippon Expressway Company and the Ministry of Land, Infrastructure, Transport and Tourism.

The expressway is signed as an auxiliary route of National Route 373 as well as E29 under the Ministry of Land, Infrastructure, Transport and Tourism's "2016 Proposal for Realization of Expressway Numbering.

From Sayo Junction to Sayo Toll Gate the expressway is maintained and tolled by the West Nippon Expressway Company.

That section of the expressway is maintained by the Chūgoku branch of the Ministry of Land, Infrastructure, Transport and Tourism.

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