Engineering Impossible Highways – The longest structures on earth

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Millions of drivers travel the world’s superhighways each year. See a multi-billion dollar expansion project in Houston where a stretch of superhighway is being widened to 20 lanes & Take a ride atop the High-Five, a 12-story, five-level interchange that’s become the latest Dallas tourist attraction. Then it’s off to China’s 28,000-mile National Trunk Highway System
we’ll construct, and deconstruct, the roundabout ribbons that comprise the world’s Superhighways. Our road trip starts in Houston, Texas where a multi-billion dollar expansion project is widening a stretch of superhighway to a spacious 20 lanes. Then we’re off to China’s 28,000-mile National Trunk Highway System. .
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