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Trimble Alignment Planning software can identify a feasible alignment and then optimize it. However, if the constraints applied to the study do not allow a feasible alignment to exist, the software may generate undesirable results.
Requiring a road to pass under a railway line at the same time that it has to maintain a minimum altitude while crossing a flood plain.
Requiring a road and its earthworks to stay within a narrow corridor as it climbs a mountain with a low maximum grade. The road requires distance to climb, but the narrow corridor limits winding, and the grade constraint forces the alignment so far below the natural surface that the earthworks extend beyond the corridor.
The solution is to gradually add constraints to a project, one after another. You can then identify and correct constraints that may have a negative effect on the system as they arise.
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