[1] The route is signed E6 under Ministry of Land, Infrastructure, Transport and Tourism's "2016 Proposal for Realization of Expressway Numbering.

"[2] The first section of Sendai-Hokubu Road to open was the 5.2-kilometer-long (3.2 mi) section between the road's eastern terminus at the Sanriku Expressway and Rifu-Shirakashidai Interchange on 19 May 2002.

At the time, there was no access to the northbound lanes of the Sanriku Expressway and from the southbound lanes to eastbound Sendai-Hokubu Road, this has since been fixed.

[3] The toll road was damaged on 11 March 2011 during the 2011 Tōhoku earthquake and tsunami.

Inspections after the disaster showed that the road had sunken in places due to soil liquefaction.