The following illustration describes the Inside of Curve pivot method for a divided planar roadway.
Distorted Median means when superelevation is applied, the median width remains that same, but either side raises or lowers to accomodate the superelevation. This option distorts the median shape, and the 
pivot points maintain their original position.
For an explanation of superelevation diagrams, see Superelevation Axis of Rotation Pivot Methods.
