"土砂崩れの生鼻崎トンネル 2年半ぶりに開通" [Conclusion of landslide work on Oibanasaki Tunnel. Opening for the first time in two and a half years.] (in Japanese). Nippon News Network. 15 December 2020. Archived from the original on 15 December 2020. Retrieved 25 February 2021.
"津軽自動車道 柏~浮田計画段階評価" [Tsugaru Expressway Kashiwa-Uchida Planning stage evaluation] (PDF). www.thr.mlit.go.jp (in Japanese). 29 August 2014. Retrieved 25 February 2021.
mlit.go.jp
"一般国道の路線別、都道府県別道路現況" [Road statistics by General National Highway route and prefecture] (PDF) (in Japanese). Ministry of Land, Infrastructure, Transport and Tourism. Retrieved 19 February 2020.
平成27年度全国道路・街路交通情勢調査 一般交通量調査 箇所別基本表 [2015 Traffic Report by intersection] (PDF) (Report). Washington State Department of Transportation. 2015. p. 5. Retrieved 25 February 2021.
sankei.com
"4人死亡事故で懲役20年 青森地裁" [20 years in prison for incident that caused four fatalities. Aomori District Court]. Sankei Shimbun (in Japanese). 8 June 2020. Retrieved 25 February 2021.
"土砂崩れの生鼻崎トンネル 2年半ぶりに開通" [Conclusion of landslide work on Oibanasaki Tunnel. Opening for the first time in two and a half years.] (in Japanese). Nippon News Network. 15 December 2020. Archived from the original on 15 December 2020. Retrieved 25 February 2021.
wikisource.org
ja.wikisource.org
"一般国道の路線を指定する政令" (in Japanese). Retrieved 18 October 2019 – via Wikisource.