Skycycle
A human powered “roller coaster” located at
Okayama Prefecture’s Brazilian Washuzan Highland Park in Japan. Unlike a traditional roller coaster, this one is slow and terrifying as opposed to fast and terrifying.
Aside from seat-belts there isn’t much keeping you safe. It is equipped with two sets of pedals so each of the passengers can control the speed. There are multiple people riding Skycycles so its up to the riders to make sure they don’t run into each other.
HERE is a video.