A convoy of trucks passes a launch pad as it makes the journey from Port Canaveral to the Vehicle Assembly Building's high bay 4 at NASA's Kennedy Space Center in Florida. The trucks carry Ares I-X upper stage simulator segments, wrapped in blue protective plastic. The simulator comprises 11 segments that are approximately 18 feet in diameter. Most of the segments will be approximately 10 feet high, ranging in weight from 18,000 to 60,000 pounds, for a total of approximately 450,000 pounds.