The driver of a big truck, "big rig," or semi-trailer truck is required to display a reasonable amount of care when taking the roadways. In most cases, drivers do that. But the fact that there are more than 500,000 truck accidents every year in this country attests to the fact that sometimes that effort fails. There can be many reasons for a truck accident, including driver error, hazardous conditions, and faulty equipment. If any of those conditions exist on the part of a truck driver, an accident victim may have grounds to file a truck accident lawsuit. One of the most common causes of truck accidents is truck driver fatigue, responsible for 30% of all truck accidents. But that can be difficult to prove if you don't know where to look. Truck accident attorneys are experienced in these areas. They can find the evidence if it exists and help you ascertain if it is sufficient for you to file a truck accident lawsuit.