Vertical Velocity

The Flash: Vertical Velocity is an inverted steel roller coaster located at Six Flags Great America in Gurnee, Illinois. The roller coaster is themed to the DC Comics character, The Flash. Originally named Vertical Velocity, the ride received a re-theme in 2022. Manufactured by Intamin under the trade name "Twisted Impulse Coaster", this launched shuttle-style coaster, located in the DC Universe (formerly Yankee Harbor) section of the park, has been operating since May 18, 2001.