Multiple choice general knowledge Which is the longest highway in the world? Trans-Siberian Highway Pan American Highway Trans-Canada Australia’s Highway 1 Reveal answer Fill a bubble to check yourself B Correct answer Explanation The Pan American Highway is the world's longest highway network, stretching approximately 30,000 km from Alaska, USA through North, Central, and South America to Argentina. The Trans-Siberian Highway is the second longest at about 11,000 km.