Curb Grading

[Anonymous]

I am trying to create a curb using the Grade to Distance procedure from a feature line that represents my asphalt limits. 

I would grade to distance 2' with 0% grade, then .01' with 5000% grade, then 0.5' with 0% grade to finish the curb.

However when I try and go this way the corners of the curb turn out to be curves (See attached image). Is there a setting I can change to make it stop doing this? I know I could use stepped offset but I want the curb and the grading from the top back of curb to extisting ground to all be dependent of my original asphalt limits feature line.

[TerryDotson]

Even with a less than optimal API, a lot can still be done in Civil3D.

Demo Example: http://www.dotsoft.com/demos/gmFeaLnkOfs.htm