The longest highway in the world is
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Trans-Siberian Highway
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Trans-Canada Highway
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Route 6
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Australia’s Highway 1
B
Correct answer
Explanation
The Trans-Canada Highway is recognized as the longest national highway in the world, spanning approximately 7,821 km (4,860 miles) from St. John's, Newfoundland to Victoria, British Columbia. While the Pan-American Highway is longer overall, it's not a single national highway. The Trans-Siberian Highway is longer but not recognized as a continuous national highway system.