In the late 90s, early 2000s parks really sprang to build the tallest, fastest, longest and wildest coasters and rides in the world to gain the attention of guests. One of those coasters was one of the weirdest coasters to come out of this era was the 4D coaster. Since its debut it has gone on to morph into a modern age of out of control rides. around the world. But how do they work?