Two parties, one strip of ground, one stated use
Every easement has two sides to it. On one side is the landowner, who keeps title to the ground. On the other is whoever holds the right, and what that party holds is permission to use part of the ground for a particular purpose. Pulaski County's Unified Development Ordinance fits the elements of a granted easement into a single definition for its own use: a right that is deeded, set down in recorded writing, and given by the owner to another party for a specific limited use.
That definition lists its examples as access and drainage, water and sewer, and public utility, and Virginia law reaches past it in two ways. An easement need not be deeded: the utility easements covered by section 55.1-306.1 of the Code of Virginia include prescriptive ones, which come from long use rather than a grant. And a written easement's scope is not always only its own terms: under subsection D of the same section, broadband and other communications service is "a permitted use within the scope of every easement" for electric distribution or communications lines, unless the granting deed or other instrument expressly prohibits it.
Finding the recorded paper, including the old paper
A recorded easement can be looked up rather than guessed at. It may be drawn on the plat, the recorded map of the lot, described in the deed, or set out in a separate recorded grant made by someone who owned the land before you, so search the land records index for the parcel rather than stopping at your own deed and plat. In Carroll County those records are kept by the Circuit Court Clerk, and elsewhere the county will know which office keeps its deed records. A clean search does not rule out an easement that arose from long use, so ask the utility too. If some other part of the job already had you pull a plat, part of the answer may be sitting in that folder.
The index can reach a long way back. Carroll County's land record index can be searched online back to 1842 without paying a monthly fee, though that service does not show the recorded images, and seeing those takes either a paid subscription with a notarized agreement or a visit to the Circuit Court Clerk's office in Hillsville, 276-730-3070.
Once you have the document, the party it names is the one to ask what the right means for your plans, and that conversation belongs before anybody sets a form. We place the locate request for the digging we do. What comes back can change where the forms go, or whether a slab goes in that spot. Whether a slab may sit over the strip at all is a separate argument, made in full on can concrete go over an easement, and the order a job runs in keeps the recorded question and the buried one apart.
Not the road, and not a zoning line
Three different instruments get called by the same loose names in conversation, and each one comes from a different place. An easement is a right someone holds over part of your land, under a recorded document or through long use. The strip along a public road falls inside the road authority's right of way, which in Virginia has its own published definition, and which takes its own permission; the right of way entry defines it. A setback is a distance set by a local zoning ordinance, and it exists only where a locality has adopted one.
A driveway can clear the setback, stay out of the road strip, and still run the length of a drainage easement that never came up in conversation, so check all three before the concrete is ordered rather than after. Where a recorded easement falls on the ground is a question for a surveyor, or for a lawyer if it is disputed, and on work that runs along a lot line, walks and steps down the side of a house included, it is worth settling before the forms go down.