pjsteele,
If the easement was granted to your neighbor by the previous owner of your property, to give your neighbor permanent rights to use the driveway, then you probably (most likely) cannot extinguish it without his permission.
If the wording of the easement has specific language as to what rights your neighbor has, then those are the only ones that he can exercise. If the language is broad or ambiguous, then a court would have to determine what was intended or is reasonable.
If your neighbor is using his property for an illegal use, then the traffic generated by the illegal use would probably be viewed by a court as an undue burden on the easement, and may order the neighbor to cease that use (but probably not all use).
A court has wide latitude in determining what is a reasonable use, but will rarely terminate a use.
We need to know what the exact wording of the easement grant says before giving any specific advice.
RAMIDAZA: Start a new thread, this thread is for discussion of pjsteele's question only.