United States Of America: The World’s Biggest Road Networks

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The US road network exceeds 6.58 million kilometres in total length, making it the world’s longest and biggest road network. It comprises approximately 4.3 million kilometres of paved roads including 76,334km of expressways and 2.28 million kilometres of unpaved roads. The country’s road network includes many of the world’s longest highways. The country’s vast highway network consists of three categories of roads, namely the interstate highways (Interstates), the US numbered highways (US Routes), and the state highways. The Interstate 90 (I-90), which connects Seattle, Washington, Boston and Massachusetts, spans over 4,990km and is the longest Interstate Highway in the country. Route 20 (US 20), an east-west highway measuring 5,415km in length, is the longest single road in the country and one of the world’s longest highways.