Riding on a roller coaster is a thrilling experience. People wish they could ride a roller coaster at least once in their lives. Have you heard about the Do-Dodonpa roller coaster? It is the fastest roller coaster in the world with the fastest acceleration, reaching a top speed of 172 km/h (106.9 mph) in 1.8 seconds. Do-Dodonpa roller coaster is located at Fuji-Q Highland in Fujiyoshida, Yamanashi, Japan. Unfortunately, it has now been shut down temporarily after several riders broke their bones. According to a report, nearly six riders have suffered bone fractures since December 2020.

The Do- Dodonpa had reported just one customer was injured in 20 years. The single incident that prompted concerns prior to 2020 December happened on 15 May 2007, when a 37-year-old man suffered a minor injury after a plastic cover at the front of the train broke away and struck his right knee.

On the other hand, recent incidents have been far more serious, leaving roller coaster and theme park experts puzzled. What's more puzzling is that initial investigations revealed no mechanical difficulties with the ride.

Sansei Technologies has now apologised to all the wounded riders, stating that the source of the injuries is yet unknown. In an interview with Vice, Naoya Miyasato, a Nihon University architecture professor who specialises in roller coaster designs, said that the injuries could be the result of quick acceleration.