I didn't put the actual expression in the post, just the formula. I did go and create the expression for both formulas that I found in this location:
http://fredbobchris.googlepages.com/intermittentblockoftheday with the date of 04-04-2008.
It looks like Civil 3D doesn't like to divide the Radius, so that's why there is more than 2 formulas.
Christopher
http://civil-3d.blogspot.com/
Civil Reminders
http://blog.civil3dreminders.com/
http://www.CivilReminders.com/
Alumni