(Delaware Extension) – $1,970,000 per mile Northern Indiana Toll Road – $1,790,000 per mile Garden State Parkway – $1,720,000 per mile Massachusetts Turnpike – $1,600,000 per mile Thruway, New York to Pennsylvania Line – $1,547,000 per mile Ohio Turnpike – $1,352,000 per mile Pennsylvania Turnpike (early construction) – $736,000 per mile Statistics The United States has the largest network of roads of any country with as of 2009. The Republic of India has the second-largest road system globally with of road (2013). The People's Republic of China is third with of road (2007). The Federative Republic of Brazil has the fourth-largest road system in the world with (2002). See List of countries by road network size. When looking only at expressways, the National Trunk Highway System (NTHS) in China has a total length of at the end of 2006, and 60,300 km at the end of 2008, second only to the United States with in 2005. However, as of 2017, China has 130,000 km of Expressways. Global connectivity Eurasia, Africa, North America, South America, and Australia each have an extensive road network that connects most cities. The North and South American road networks are separated by the Darién Gap, the only interruption in the Pan-American Highway. Eurasia and Africa are connected by roads on the Sinai Peninsula. The European Peninsula is connected to the Scandinavian Peninsula by the Øresund Bridge, and both have many connections to the mainland of Eurasia, including the bridges over the Bosphorus. Antarctica has very few roads and no continent-bridging network, though there are a few ice roads between bases, such as the South Pole Traverse. Bahrain is the only island country to be connected to a continental network by road (the King Fahd Causeway to Saudi Arabia). Even well-connected road networks are controlled by many different legal jurisdictions, and laws such as which side of the road to drive on vary accordingly. Many populated domestic islands are connected to the mainland by bridges. A very long example is the Overseas Highway connecting many of the Florida Keys with the continental United States. Even on mainlands, some settlements have no roads connecting with the primary continental network, due to natural obstacles like mountains or wetlands, or high cost compared to the population served. Unpaved roads or lack of roads are more common in developing countries, and these can become impassible in wet conditions. As of 2014,