World's longest, largest, busiest highways
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The United States has the world's largest network of highways, including both the Interstate Highway System and the US Highway System.
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Image: Eastbound Interstate 78/US Route 22.
Photographs: Dough4872/Wikimedia Commons.
World's longest, largest, busiest highways
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At least one of these networks is present in every state and they interconnect most major cities.
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Image: Motorists travel westbound along Interstate 40 after several inches of snow fell during a winter storm in Flagstaff, Arizona.
Photographs: Joshua Lott/Reuters.
World's longest, largest, busiest highways
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China's highway network is the second most extensive in the world, with a total length of about 3.573 million km.
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Image: Shepherds lead their flock of sheep along on the Guozigou segment of the Lianyungang-Horgos expressway as vehicles drive past the other side of the expressway.
Photographs: Reuters.
World's longest, largest, busiest highways
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China's expressway network is also the second longest in the world, and it is quickly expanding, stretching some 85,000 km at the end of 2011.
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Image: A general view of heavy traffic on a highway during the morning rush hours in Shanghai.
Photographs: Carlos Barria/Reuters.
World's longest, largest, busiest highways
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The Pan-American Highway is longest international highway, which connects many countries in the Americas.
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Image: Pan-American Highway in the Greater Buenos Aires, Argentina.
Photographs: Arcibel/Wikimedia Commons.
World's longest, largest, busiest highways
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It stretches across a distance of nearly 47,000 kilometres.
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Image: Pan-American Highway in El Salvador.
Photographs: Ll1324/Wikimedia Commons.
World's longest, largest, busiest highways
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Australia's Highway 1 is a network of highways that circumnavigate the Australian continent, joining all mainland state capitals.
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Image: Highway traffic is backed up behind a piece of heavy mining equipment as it rolls though Dalby, 180 km (112 miles) west of Brisbane.
Photographs: Tim Wimborne/Reuters.
World's longest, largest, busiest highways
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At a total length of approximately 14,500 km (9,000 mi) it is the longest national highway in the world.
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Image: A snowmobiler crosses the Trans-Canada Highway just north of Oakville, Manitoba.
Photographs: Reuters.
World's longest, largest, busiest highways
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The United States has the largest national highway system.
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Image: An aerial photograph shows traffic on the southern portion of the 18-Mile Stretch, a facet of U.S. Highway 1 that connects South Florida with the Florida Keys in Key Largo, Florida.
Photographs: Andy Newman/Reuters.
World's longest, largest, busiest highways
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It has around 6,430,366 kilometres of highways.
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Image: A line of fire trucks make their way down US highway 89 toward the Wood Hollow Fire north of Fairview, Utah.
Photographs: George Frey/Reuters.
World's longest, largest, busiest highways
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The Highway 401 in Ontario, Canada has the busiest highway.
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Image: Highway 401.
Photographs: Ryan Stubbs/Wikimedia Commons.
World's longest, largest, busiest highways
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The 400-series highway stretches 817.9 kilometres from Windsor to the Quebec border.
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Photographs: SeRVe61/Wikimedia Commons.
World's longest, largest, busiest highways
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The Katy Freeway (part of Interstate 10) in Houston, Texas, has the widest highway (maximum number of lanes).
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Image: Katy Freeway.
Photographs: Socrate76/Wikimedia Commons.
World's longest, largest, busiest highways
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This section was widened in 2008 to include a total of 26 lanes.
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Image: Cars travel on an almost deserted snow covered downtown highway after an overnight storm dropped five inches of snow in Dallas, Texas.
Photographs: Gary Hershorn/Reuters.
World's longest, largest, busiest highways
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Interstate 5 along a 2-mile section between Interstate 805 and California State Route 56 in San Diego is widest highway, with maximum number of through lanes.
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Photographs: Eric Guinther/Wikimedia Commons.
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