Final answer:
Driver error is the principal cause of most automobile accidents, according to the American Automobile Association (AAA).
Step-by-step explanation:
The principal cause of most accidents can vary depending on the context. In the case of automobile accidents, driver error is often considered the primary cause. According to the American Automobile Association (AAA), driver error is responsible for approximately 54 percent of all fatal auto accidents. This includes factors such as distracted driving, speeding, and impaired driving.