Also, delivery people are only allowed to be out driving for a certain number of hours every day, and only certain number of total number of hours every week, by Department of Transportation regulations.
According to the FedEx Ground guy who picks up the packages at my friend-who-has-his-own-business's place, if they can't deliver a package that's on the truck, no matter what the reason, they have to mark it down as "Attempted delivery" because, since it was on the truck, they did try to get it delivered that day. Whether they couldn't deliver it because they weren't allowed to be out any more hours or because no one was home or because they couldn't get to the driveway because there was a five foot wall of snow (that's happened at my house), or because their truck broke down or something, they have no other way to mark it except as "attempted delivery".
Just some additional information.
