On this episode of Modern Marvels 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. We'll take a ride atop the High-Five, a 12 story, five level interchange that's become the latest Dallas tourist attraction. We'll go to MIT and discover how a single distracted driver can cause a major traffic jam. We'll take a ride along two of the most stunning superhighways in the world, I-70 through Glenwood Canyon and H-3 on the island of Oahu, and learn why building them was anything but paradise. Finally, we'll play a cutting edge video game that's training emergency personnel how to unclog a clogged superhighway.
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