The Six Flags Great Adventure Joker roller coaster is a 4-D, free-fly coaster – a totally new concept in roller coaster engineering – and it lifts riders straight up a 12-story, 90-degree hill before flipping them head-over-heels at least six times along a weightless journey. Riders are strapped into rotating “wing seats” with no track above or below them as they experience leaps and dives along a horizontal plane, as well as unexpected drops as they tumble from one level to the next. Colliers Engineering & Design provided conceptual design layout services; ride foundation engineering, including pile-supported foundations; structural design of all support buildings (load stations, maintenance/storage building, queue structure, and operations building); civil/site engineering; permitting; geotechnical engineering; full site aerial topographic surveying; and construction stakeout services for the construction of this new extreme coaster.