If you don't take action, they will gain an easement on your property. An easement by prescription is where someone’s property is used for an extended period of time without objection. An example would be where a driveway leading to one property crosses the corner of the neighboring property as it enters from the road which is exactly what you have here,. If this use continues uninterrupted, the use will become a permanent right. The requirements for establishing an easement by prescription are similar to those for adverse possession. The claimants must establish, by clear and positive proof, that they have enjoyed the use of the property for at least twenty years, and that such use has been adverse, under claim of right, continuous, uninterrupted, visible, exclusive, and with the knowledge and acquiescence of the true owner of the land. Pevear v. Hunt, 924 S.W.2d 114 (Tenn.Ct.App.1996); House v. Close, 346 S.W.2d 445 (Tenn.Ct.App.1961); Nashville Trust Co. v. Evans, 206 S.W.2d 911 (Tenn.Ct.App.1948)
You will need to take some action to prevent it from becoming a permanent easement. You can draw up an agreement that their use is permissive and have that recorded if you do not have a problem with the paving. That would appear to be the case since you have waited this long to do anything. Any local real estate attorney can properly draft it for you. good luck
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