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hi.as below figure i've made a serpantine curve that starts from one line of alignment and end on the other line.
i wanted to know how can c change alignment direction when these two feature line and alignment meet each other in order to change the alignment path?
Not entirely sure that I understand what you're trying to do here. You can reverse the direction of a whole alignment, but not just a part of it.
Put in a station equation. You can then tell it to be "Decreasing".