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The longest international highway in the world is the Pan American highway. It connects many countries in the Americas and is almost 25,000km long.

The longest national highway (point to point) is the Trans- Canada Highway, which is 7,821km long. This highway runs east-west across southern Ontario. It starts in Newfoundland on the east coast and ends in British Columbia on the west coast.

The longest national highway (circuit) is Australia's Highway 1, which is over 20,000 km long. This highway runs almost the entire way around the continents coastline connecting most of the major cities.

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Q: The longest highway in the world?
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