It a neighbor I'm having a dispute with and he keeps parking in my property next to the road
Depends. If he is landlocked you can stop him. And, there are other things. Are you sure it is YOUR property and not an easement on the side of the road?
When you live in an unincorporated area like Diana, you really have to study the deed conveyances and have surveys. When you purchased the property, you may or may not have gotten a title insurance police, but if you financed it, I'm almost certain that there is a Mortgagee's Policy which stipulates exactly what property is insured and what "exceptions" there are to the policy. These exceptions are for things that are not really "your" property, even though you may have to mow it every week.
When roads are built, they are built on tracts of land that is deeded (usually with a Right of Way Deed) to the city, county, or state. The area covered by the Right of Way is not owned by you even though the street may not cover the entire Right of Way. You do not have the authority to stop anyone from using the Right of Way property.
Bottom line is that nobody here is going to tell you one way or another without doing a rather intensive search of your property records and an examination of your survey.
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