DOT stands for Department Of Transportation. It means there are DOT regulations that you, as well as Fedex, will have to abide by. It's actually a good thing. It helps to prevent Fedex from slaving you to death by requiring a 10 break from one day to the next. So, if you worked till 10:00 pm the night before, you could not start work until 8:00 am the next morning.
Fedex doesn't like that at all!
I returned your pm. I hope you take my advice.