Semi-trucks and trailers are big, fast, and sometimes extremely dangerous to other vehicles on the road. With the average commercial truck massing more than 25 times that of the average car, a truck vs car collision is bound to cause catastrophic consequences. The sad truth is that in a situation where a semi-truck is operated carelessly, or in error, the other vehicles on the road are often the ones that bear the brunt of negligence. Some of the causes of these crashes are somewhat avoidable while others just occur as a surprise. Ahead are four of the most common causes of truck vs car accidents.