Can I put a fence on my property if it will block my neighbor's access?

Question Details: I agreed to let neighbor share driveway as long as they lived there. However, now they have moved and are putting the house up for sale. I'm afraid that whoever buys the house may block the entrance. They originally had a driveway and removed pipe from the ditch so now they would have to put a new pipe in and cover it up with dirt. I want to put up a fence on our side of the property which would block off access to my driveway. They have lived there about 10 years. Can I do this?

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