The road is managed by the Ministry of Land, Infrastructure and Transport and is numbered E4A as an extension of the Tōhoku Expressway.
In Tōhoku, the expressway meets Aomori Prefecture Route 211 at its former western terminus, Kamikita Interchange.
Beyond Route 394, the expressway is known as the Tenmabayashi Road, a 8.3 kilometers (5.2 mi) section that is currently under construction.
This section, once completed, will run to the expressway's future western terminus at National Route 4.
This section connects the Daini-Michinoku Toll Road to Aomori Prefecture Route 211.