Causes of Car Accidents Car accidents happen all the time and often cause serious injuries. They also have a negative impact on the lives of those injured and their families. These injuries are caused by the transfer of energy in the event of an collision. These injuries include whiplash, spinal cord trauma and limb injuries. Driver Errors Driver error is the primary cause of most car accidents in the United States, regardless of the vehicle. Fortunately drivers can avoid such accidents by following safer driving techniques and paying attenti