The Chūgoku Expressway is an expressway in Japan, which extends from Suita, Osaka to Shimonoseki, Yamaguchi. It connects Kansai and Chūgoku regions in western Honshu, Japan's main island. Other major cities along the expressway are Tsuyama, Kobe, and Hiroshima. It was opened in 1970, and has a total length of 540.1 kilometers (335.6 mi).

Asian Highway 1 (AH1) is the longest east-west route of the Asian Highway Network, running 20,557 km (12,774 mi) from Tokyo, Japan via Korea, China, Southeast Asia, Bangladesh, India, Pakistan, and Iran to the border between Turkey and Bulgaria west of Istanbul where it joins end-on with European route E80, running all the way to Lisbon, Portugal.