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The farmer is under a duty not to cause nuisance or damage.
If he damages the driveway he is responsible for repairing it.
He is also responsible for maintenance and repairs under the doctrine of mutual benefit and burden. He is not liable for any improvements.
Can I clarify anything else for you?
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It depends on the wording of the right-of-way. It would be very difficult to reduce the amount of traffic without causing an obstruction.
As I said on the other thread, the fact that he may have different access is not relevant.
If he doesn’t need this access and it’s causing a problem for you, he might be agreeable for you to pay him some money to relinquish the right-of-way. It comes down to how much you would be willing to pay and how much he would be willing to accept because there is no formula for that.