Truckers are responsible for very large vehicles that are very heavy and can do considerable damage. This is one reason why semi truck accidents are so horrible. The federal government has stepped in to try to reduce the number of truckers who are fatigued, but they can only do so much.
One thing that you have to consider with trucker fatigue is that there are many causes of it. While one of the most common causes is not getting enough rest, other factors like driving on familiar roads, driving irregular hours and medical conditions can also lead to fatigue.
Limiting the driving time for truckers is one step that the federal government took. For truckers who are carrying products, the limit is 11 hours per shift. For truckers who are operating passenger carrying vehicles, the limit is 10 hours per shift. These time limits are only for driving.
If the trucker does non-driving duties on a shift, those hours increase the number of working hours. For property carrying drivers, total working shifts can't be longer than 14 hours, but only 11 of those can be driving. For passenger carrying drivers, working shifts can be up to 15 hours, but only 10 of those can be driving hours.
If you are injured in a semi truck accident, the cause of the accident can have an impact on the case. Looking at a trucker's log book might let you know if the trucker was in compliance with the hours of service regulations. If the trucker wasn't in compliance, you can use that information as part of that case.
Source: Stop Unsafe Trucks, "Accidents & Fatigue," accessed March 03, 2017