The Caution Zone was a backyard roller coaster built by Will Pemble in Orinda, California. [1] [2] [3] Pemble was inspired to build, alone with his family members, [4] the roller coaster after riding the Kingda Ka in the Six Flags Great Adventure amusement park. [5]
The coaster was 180 feet long, fifteen feet high and cost US$3500 to construct. [1] It ran until 2015.