Millions of drivers travel the world's superhighways each year. See a multi-billion dollar expansion project in Houston, Texas 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. Discover how a single distracted driver can cause a major traffic jam. Finally, play a cutting-edge video game that's training emergency personnel how to unclog a clogged superhighway.