AH1


Asian Highway 1 is the longest east–west route of the Asian Highway Network, running from Tokyo, Japan via the Korean Peninsula, China, Mainland Southeast Asia, the South Asia, and the Iranian Plateau to the international border between Turkey and Bulgaria west of Istanbul where it joins European route E80, running all the way to Lisbon, Portugal.

Japan

The 1,200-kilometre section in Japan was added to the system in November 2003. It runs along the following tolled expressways:
From Fukuoka, the Japan–Korea Undersea Tunnel has been proposed to provide a fixed crossing.

South Korea

The section in South Korea mainly follows the Gyeongbu Expressway. The Highway Boundary of South and North Korea.
In future,
will become part of AH1 instead of the current National Highway 1 and National Highway 22.

Cambodia

File:Abhar exit on Qazvin-Zanjan freeway.jpg|thumb|Abhar exit on Qazvin-Zanjan freeway in Iran
File:Qazvin Zanjan Freeway.jpg|thumb|Qazvin Zanjan Freeway in Khorramdarreh County-Zanjan in Iran

Turkey

The route AH1 links to in Turkey. The E80 continues in the E-road network from the border station at Gürbulak in Turkey to Istanbul followed by E80 highways to Kapitan Andreevo/Kapıkule, Sofia, Niš, Pristina, Dubrovnik, Pescara, Rome, Genoa, Nice, Toulouse, Burgos, Valladolid, Salamanca and finally Lisbon on the Atlantic Ocean.