Automated Widening on Offset Alignment Based on Curve Radius — Start at Spiral In, Peak at Curve In, Taper at Spiral Out

[Beka_Tchigladze]

Hi everyone,
I'm trying to implement automated widening on an offset alignment in Civil 3D, based on predefined curve radius values and corresponding widening widths. I’ve already created a custom widening table in the Design Criteria XML file, where each radius maps to a specific widening value.
What I want to achieve is the following:
• Start the widening exactly at the Spiral In point
• Gradually increase the widening until it reaches the maximum value at the Curve In point
• Maintain the maximum widening through the curve
• Then begin tapering down at Spiral 2 In
• And finish the taper at Spiral 2 Out
So far, I’ve managed to define the widening widths per radius, but I can’t figure out how to control the widening transition along the alignment geometry — especially how to tie the widening start and end points to the spiral geometry.
Is there a way to do this using the Design Criteria file alone? 
Any guidance or examples would be greatly appreciated.
Thanks in advance!

Beka

[andrewpuller3811]

You should check into the transition lengths under the Superelevations Tables node.

You might also need to at the superelevation attainment methods.

[Beka_Tchigladze]

No luck 😞