Since the late 1990s, China's national road network has been significantly expanded through the creation of a network of national highways and expressways. In 2018, China's highways had reached a total length of 142,500 km (88,500 mi), making it the longest highway system in the world.[467] China has the world's largest market for automobiles, having surpassed the United States in both auto sales and production. A side-effect of the rapid growth of China's road network has...