What are the most common reasons for big rig or commercial truck accidents?

Some of the more common contributing factors, or common causes of truck accidents include:

Distracted driving
Improperly loaded cargo
Insufficient/infrequent maintenance
Thin tires
Shoddy inspections
Driver fatigue
Speeding
DUI by alcohol or drugs
Failing to obey traffic regulations
Poor weather
Lack of training
Lack of proper driver safety programs