Change portion of driveway grade


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I am building a driveway on a steep lot. I am trying to keep the slope to 12%. When the driveway turns at the switchback it is very steep.

What is the best way to control that slope on my plan? I don't want it level, I just want to maintain a 12% or less grade. Obviously it naturally gets steep at the turn because it's turning straight down the steep slope.

I also want to make that turn area wider than the rest of the driveway.

Can I make a poly line area the shape I want and then convert that to a terrain area and then add elevation data to control the slope?

Thank you for any help.




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