Chances are that you see commercial vehicles every time you take to the road. In Pennsylvania, medium and heavy trucks, buses and school buses operate daily throughout the Commonwealth. These are the package delivery trucks that deliver your online purchases, the chartered buses that shuttle gawking tourists through Amish country and even the bread trucks that deliver doughnuts to your favorite coffee shop. The sheer number of this commercial fleet and their frequency on the roads ensures that there are always a fair number of accidents caused by their use.
The good news is that Pennsylvania has specific regulations that govern these vehicles and attempt to limit commercial vehicle accidents. Here are a few examples of those rules taken from the Pennsylvania Department of Transportation's "Subchapter F":