7.1.3. Revolving Alignment
A revolving alignment is also supported on a calculated alignment and it meets the condition that it passes via a fixed point of known coordinates or at a distance from the latter. To achieve this, it modifies the length of the fixed alignment and calculates the length of the revolving alignment.
Two types are distinguished between, Revolving and Back-revolving, depending on whether it is supported on the previous or subsequent alignment. The data it includes are the radius, the clothoid parameters, the crossing point, and optionally a distance to the crossing point.