Types of Semi Truck Accidents Due to their weight and size semi trucks are extremely heavy and are able to roll over at any speed. These accidents can cause serious injuries for the people involved. Driver errors are the main reason behind semi-truck accidents. However, other factors could also cause a rollover crash. Rear-End Collisions A serious injury can result from collisions between vehicles vehicle. This is particularly relevant when a commercial vehicle such as a semi-truck is involved. These vehicles can be as heavy as 80,000 pounds