Will,
To answer your question about the spiral:
An easement curve is straight (not changing direction) at the point where it begins and then gradually changes direction and becomes more tightly curved. The radius is infinite at the starting point and gradually becomes smaller. At some point, the radius may remain constant (circular - like curved sectional track) or may begin to increase until the curve becomes straight again. The spiral is curved (changing direction) at every point and not straight at any point, so no part of it contains an easement. The spiral can serve as a transition curve from one radius to another but it is not a true easement because the initial curvature is not zero.
MELGAR
