Types of Semi Truck Accidents Due to their size and weight semi-trucks are top heavy and are able to roll over at any speed. These accidents can result in serious injuries for the people involved. The most common cause of semi-truck accidents is driver error. But, other factors can also contribute to a rollover crash. Rear-End Collisions If a vehicle rear-ends a vehicle the result could be serious damage. This is particularly the case when a commercial truck like a semi-truck is involved. These vehicles can be as heavy as 80,000 pounds and co