### #1 pinkpig

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Posted 16 September 2008 - 04:26 AM

How to calculate a critical length of grade for a vertical curve?

### #2 nomind

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Posted 16 September 2008 - 03:45 PM

QUOTE (pinkpig @ Sep 16 2008, 04:26 AM) <{POST_SNAPBACK}>
How to calculate a critical length of grade for a vertical curve?

I found the answer from Green Book Page 240.
where vertical curve is part of critical Length of grade, an approximate equivalent tangent grade should be used.
Refer to Exhibit 3-69
Vertical curve Type II and IV, the grade algebraic difference is not too great, critical length of grade maybe measured as between VPI.
I would think it is measure btw PVC and PVT

For Vertical Curve Type I and III, one-quarter of vertical curve length is considered as part of critical length of grade.

If anything wrong, please point it out.
Thanks

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