Which is longest road or highway or motorway in the world

Context: This article lists the world's longest road routes that are either officially numbered or otherwise known under a single name. Some of the roads may still be partially planned or under construction.

Pan-American Highway	30,000 km 	Americas	Prudhoe Bay, Alaska, United States United States	Puerto Montt or Quellón, Chile Chile or Ushuaia, Argentina Argentina	Longest road according to the Guinness Book of Records.
Incomplete at the Darién Gap, causing the northern and southern segments to be actually long about 11,500 and 9,600 km.

Answer: The longest road is a highway called Pan-American highway. It spans 30000 Kilometers or 19000 miles. It starts from Prudhoe Bay, Alaska in United States and ends at Puerto Montt or Quellón, Chile Chile or Ushuaia, Argentina Argentina