Even if passengers and ride operators follow guidelines are roller coasters safe Each year as amusement parks compete to draw in crowds new faster and taller roller coasters are built. In 2011 Japan opened what is claimed to be the world's steepest roller coaster. lts name Takibisha means high-flying car And in fact riders may feel like they are flying or catually falling as they experience its steepest drop form the dizzying height of 141 feet at and angle of 121 degrees. In abu Dhabi the roller coaster Formula rossa holds the record for the fastest speed at 149 miles per hour. If this sounds fast that's because it is. The average passenger airplane such as a Boeing 757 reaches a speed of about 160 to 180 miles per hour at takeoff.