The "drop" on The Twilight Zone Tower of Terror at Disney's Hollywood Studios is actually a series of multiple drops, making it unique compared to standard free-fall rides. The total height of the tower is 199 feet, but the elevator carriage only drops a maximum of about 130 feet in a single sequence. What makes the ride terrifying isn't just the height, but the fact that the elevator is "pulled" down by a massive motor system at speeds faster than a natural free-fall (approximately 39 mph). This creates a sensation of weightlessness that standard gravity cannot provide. The ride uses a "randomized" drop sequence, meaning a computer selects from several different patterns of rises and falls, so you never know if you will drop 4 stories or 13 stories at any given moment. Each sequence usually lasts about 90 to 120 seconds, featuring at least one "full" drop that provides a panoramic view of the park before plunging back into the darkness of the elevator shaft.