There are many reasons for a car crash. DUI (driving under the influence) is one of the most common. A person can be in serious legal trouble when their drinking results in a car crash. DUI is one of the most avoidable factors with regards to a car crash. It is estimated that if motorists would 'just say no' when they have to operate a motor vehicle or ask someone to drive them home instead, car crash accidents and fatalities would drop by more than fifty percent in the United States.