Imagine racing from New York City to Washington, D.C. at a speed of 120 miles per hour in bumper-to-bumper traffic while checking your email or browsing for books on-line. "Smart highways" with networks of sensors send collection-detection information to your vehicle's on-board computer, ensuring that you reach your definition safely (and in just two hours). Sound impossible? A group of scientists, automakers, and university researchers plans to turn this vision into reality.