Due to the massive size and weight of an aerial lift, many factors affect their level of safety, or in many cases, danger. When a worker is not properly trained to operate an aerial lift, serious accidents are likely to occur. Accidents are also common with boom lifts and scissor lifts, leading to related injuries and fatalities every year. Boom lift accidents, included amongst aerial lift accidents, are some of the highest because of the incredible reach power and height of these machines. Scissor lift accidents are often caused by driving and positioning over uneven ground, or operating during severe weather, and can result in scissor lift tip over and scissor lift falls over accidents.