If there are only four eggs, chances are that the duck is still laying her clutch - about one a day or every other day until she is satisfied with it. Only then will she begin to incubate them. Best to just leave them alone and let the ducks care for them.

As far as the road goes, I would think that the parent ducks would lead their young ones away from it, straight to the water. You could put up a temporary barrier (chicken wire, snow fence or whatever) between them and the road, but I wouldn't bother until the duck at least begins to set.

Thanks very much. I was trying to reseach on the net and was suprised at how vague it was. I just checked the nest and she laid 2 more eggs during the night. I'm excited. I know they will lay just about anywhere. Even in a Lowe's parking lot!!!

Sad news to report. We got up this morning to find the duck eggs scattered by the nest and some of them were gone. We think she had ten. Must have been a onery racoon.
Too bad so sad.

too bad :( our guineas nests get ransacked almost every night by opossums & skunks mostly... also foxes and just about anything else. Your ducks will make more nests soon.