I've got a job that's co,oimg back to life after a half year hiatus, and naturally, the client now has substantial changes. It started out with a U-shaped loop road, with a couple of east-west connector at the top of the U exiting to side streets, a south exit, and a north-south road connecting the bottom of the U to the northernmost connector.
Now, the client wants to break the bottom of the U, add a central east-west connection the turns into the east portion of the U, and trim the N-S connector. And of course, retain all the previous information for 'future' work.
Horizontal is straightforward -- I copied the alignments to new names, reset the stationing, and turned the two (loop & N-S) into three, West loop to south exit, New east-west road that turns into the East end of the U loop, and shortened the N-S connector.
My problem is how to get the old design profile with vertical curves etc, into the new alignments for those portions where the alignments are congruent with their ancestors. Superimposing did not retain the vertical curve data, and while it looks close, is not exact.
What's a better way?