It goes without saying that commercial tractor-trailers are inherently dangerous due to their enormous size and weight. However, there are also some instances where commercial trucks are allowed a special permission to operate in configurations that make them even heavier and bigger than usual.
The Illinois Department of Transportation issues special permits that allow some nontraditional cargo to be transported throughout the state under tightly regulated restrictions. These include large industrial components, pre-manufactured homes and other oversize cargo loads that could not otherwise be reasonably transported. The following examples are some of the rules included in the application for the special permit: