The roller coaster most notoriously associated with breaking riders' bones is Do-Dodonpa at Fuji-Q Highland in Japan. Between December 2020 and August 2021, the ride was linked to at least 18 significant injuries, including nine confirmed cases of broken bones—specifically compression fractures of the spine and neck. The ride was famous for its extreme "air-launch" technology, which accelerated passengers from 0 to 112 mph (180 km/h) in a staggering 1.56 seconds, generating a force of 3.3g. While investigations found no mechanical "failures," experts suggested the injuries were caused by the sheer intensity of the acceleration acting on riders who might have been sitting in a slightly forward or incorrect position. Due to these safety concerns and the inability to guarantee a "bone-safe" experience even with modifications, Fuji-Q Highland announced the permanent closure of Do-Dodonpa in March 2024. In 2026, the site is being cleared for a new attraction, leaving a legacy of caution regarding the physical limits of human tolerance for rapid-launch roller coaster acceleration.