Ōtoyo, Kōchi in Japan. It has a total length of 166.9 km (103.79 mi). "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]...

National Route 238 (国道238号, Kokudō Nihyaku sanjūhachi-gō) is the northernmost of the national highways of Japan. It connects the cities of Abashiri and...

(in Japanese). 2 February 2019. Retrieved 1 March 2019. "高速自動車国道等の最高速度" (in Japanese). Retrieved 4 July 2023. https://newsonjapan.com/article/127903...

National Route 4 (国道4号, Kokudō Yongō) is a major national highway in eastern Honshū, Japan. Measuring 738.5 kilometers long (458.9 mi), it is the longest...

Archived from the original on 2014-10-06. Retrieved 30 September 2014. "国道109新线饮马鞍隧道开挖进尺突破4000米！". j.021east.com. Retrieved 2022-05-22. "景文3标项目叶麻尖1#隧道顺利进洞施工"...

"新突破！城开高速控制性工程吴家梁隧道掘进4000米大关_高速公路". www.sohu.com. Retrieved 2020-10-11. "国道109新线高速公路饮马鞍特长隧道贯通_北京市_交通_门头沟区". www.sohu.com. Retrieved 2024-06-25. "景文3标项目叶麻尖1#隧道顺利进洞施工"...

Kochi and Tōyō, Kochi. It has a total length of 98.3 kilometers (61.1 mi). "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]...

Nagato, Yamaguchi. It has a total length of 53.4 kilometers (33.2 mi). "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]...