While operating a Segway scooter, a man was thrown suddenly to the ground after catching a wheel on a wall. The results were a permanent catastrophic head injury. In order to quantify the effect wearing a helmet may have had in attenuating the extent of the injury, testing was conducted.  The test apparatus was required to accelerate an instrumented ATD (crash dummy) to a speed comparable to that of the Segway at the time of the accident, and subsequently to trip and release the ATD to fall freely to the ground.  Head injury criterion (HIC), as well as angular acceleration and linear acceleration data was collected from the ATD in order to determine the severity of any head impact.  A comparison study was conducted in which several tests were run with and without a helmet in order to assess the effects of helmet use in this type of accident.