Truck accidents are all too common. Truckinfo.net estimates that 15.5 million trucks are on the road in the United States and 2 million of them are tractor trailers. Let’s review truck accident statistics to learn more about when, where and how often they occur. The United States Department of Transportation estimates that more than half a million truck accidents occur each year. About 5,000 people are killed each year due to a truck accident. The occupant or driver of the car is much more likely to be killed than the truck driver. More.