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Most likely you have a prescriptive easement
with the right to access. A prescriptive easement is an easement that is earned by regular use -- it is not something that is purchased, negotiated, or granted. A prescriptive easement is simply a right to use property.
The requirements to establish a prescriptive easement are:
1. Use that is actual and open
2. Use that is adverse to the owner (w/o permission)
3. Five years of continuous use
4. Must not exclude use by the owner .
The most common legal cause of action is a “quiet title” action, a lawsuit that requests that the court determine the status of the title to the property.
Since your neighbor
is blocking use of the drive ways, unfortunately, you would have to bring a lawsuit showing a prescriptive easement and have the court determine your right to use the access. You would also include an injunction to prevent the blockage pending resolution.