For n=1, 100% accident/injury, 0% fatality. Those things shouldn't go above 10mph. The tech makes them seem like a bike until anything at all goes wrong, like

For n=1, 100% accident/injury, 0% fatality. Those things shouldn't go above 10mph. The tech makes them seem like a bike until anything at all goes wrong, like hitting a small pothole or clipping the corner of a road barrier. Then you're suddenly in mid air above a city street with nothing helping you out. A bike can handle hitting something small, and has enough of a gyroscopic effect that it doesn't just fall over.