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.
AH1 at Nihonbashi, Tokyo, the "zero milepost" for measuring highway distances to Tokyo.
Signage along the Gyeongbu Expressway with AH 1 route marker
Long Thanh Bridge
AH1, AH2 and Thailand Route 32 in Ayutthaya
The Asian Highway Network (AH), also known as the Great Asian Highway, is a cooperative project among countries in Asia and the United Nations Economic and Social Commission for Asia and the Pacific (ESCAP) to improve their connectivity via highway systems. It is one of the three pillars of the Asian Land Transport Infrastructure Development (ALTID) project, endorsed by the ESCAP commission at its 48th session in 1992, comprising Asian Highway, Trans-Asian Railway (TAR) and facilitation of land transport projects.
Asian Highway 2 sign near Ratchaburi, Thailand
A section of Malaysia's North-South Expressway in Penang. Note the Asian Highway 2 signage.
