What is the most dangerous roller coaster?

The most extreme roller coaster would be KINGDA KA, at Six Flags Great Adventure. It has a drop of 140m, the tallest drop in the world. Two other extreme coasters would be: * Top Thrill Dragster - a coaster like Kingda Ka but a shorter drop of 130m. It is located at Cedar Point. * Tower of Terror - located at Dreamworld, Australia, the coaster is launched 115m in the air before freefalling backwards. It is the tallest roller coaster in the Southern Hemisphere.