A mobile alignment is defined by its radius and the parameters of the input and output clothoids. In order to calculate it, the previous and subsequent alignment are calculated.
During the calculation process the lengths of the previous and subsequent alignments are modified in such a way that that the elements are tangential to each other.
There are cases in which two mobile alignment solutions are possible. In this case, the program opts for the shortest development solution. To use the other solution, the type has to be changed to Special Mobile.