Common causes of bus accidents include negligence on the part of the bus company or the bus driver. For example, a bus company might fail to train or supervise their drivers adequately, or a bus driver might speed or forget to signal in traffic. Other common causes of bus accidents include bus driver fatigue, bad weather, and blind spots. Commonly, bus accidents occur during left turns. Finally, because driving a bus generally requires extensive training and certification, it is not uncommon for another driver to be at fault in the case of a bus accident.