How create access to a vacant lot?

[Henley Smokey]

Hi there,

We're interested in purchasing a vacant lot that currently has no road to it, though it does have an easement granting ingress/egress from the neighboring property. Given that the easement already exists, what is necessary to create a gravel or dirt road to this vacant lot (do we need additional permission from the neighbor owner, a permit, etc.)? Also, any ideas for an economical rout would be appreciated- the neighboring lot is about 20 acres in size so the gravel/dirt road would be relatively long- Thanks!