Test Track, one of three major attractions in Epcot was built at a huge cost of about $300 million. The cost escalated as the makers had to keep redesigning the track during construction.The complicated electronic model of the ride system and lack of rides at Epcot necessitated the makers of the ride to go in for 29 cars in order to increase capacity. And they had to spend an extra year as well to come with required installations and alterations.The high speed giant slot car attraction at the Walt Disney World Resort in Bay Lake, Florida, is a simulated excursion through the rigorous testing procedures.You undergo tests at hot and cold rooms, take an acid test, a slalom and a brake test. In the end, are shot out of the building at 65 mph, the fastest ever ride at Disney's.With visitors to amusement parks yearning for more fun and thrill, more and more new attractions are coming up. In the current calendar year, several exciting new attractions including steel roller coasters and other rides that are faster, scarier and taller than some existing rides have already been thrown open to public in US and elsewhere.