Roads in South Korea

Asian Highway 1 (AH1) is the longest east–west route of the Asian Highway Network, running from Tokyo, Japan via the Korean Peninsula (South Korea and North Korea), China (Mainland China and Hong Kong), Mainland Southeast Asia (Vietnam, Cambodia, Thailand, and Myanmar), the South Asia (India, Bangladesh, and Pakistan), and the Iranian Plateau (Afghanistan and Iran) to the international border between Turkey and Bulgaria west of Istanbul where it joins European route E80, running all the way to Lisbon, Portugal.

Asian Highway route in Russia and China

highway system in South Korea

one of The Principal Roads of Joseon