Route 421 is a national highway of Japan connecting Kuwana, Mie and Ōmihachiman, Shiga in Japan, with a total length of 72 km (44.74 mi). "一般国道の路線別、都道府県別道路現況"...

National Route 8 (国道8号, Kokudō hachi-gō) is a major highway in the Hokuriku and Kansai regions of central Japan. The 574.1-kilometer (356.7 mi) highway...

National Route 1 (国道1号, Kokudō Ichi-gō) is a major highway on the island of Honshū in Japan. It connects Chūō, Tokyo in the Kantō region with the city...

National Route 7 (国道7号, Kokudō Nanagō) is a major north-south national highway on the Sea of Japan side of the island of Honshū, Japan. It traverses four...

"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新线饮马鞍隧道开挖进尺突破4000米！". j.021east.com. Retrieved 2022-05-22. 网易 (2021-09-11)...

"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"...

Shinshiro, Aichi in Japan, with a total length of 66.5 km (41.32 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]...

Shiga and Kihoku, Mie in Japan, with a total length of 163 km (101.28 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]...