Civil PE Exam - Transportation - Calculate the Minimum Length of a Spiral Curve

Grab your “Green Book'' because, today, we have a neat problem for the PE Civil Transportation Exam! 🚦 🚗 For this one, you’ll need to know the definition of a spiral curve by AASHTO, and how to calculate the minimum acceptable length for a spiral curve given the design speed and the horizontal curve radius.
Try to solve this one on your own first, then jump back in and let's solve it together. 😉
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Spiral Curve
Greenbook
Index: Minimum Length of Spiral - 3-76
Follow equation
'L' should be the larger of' the two equations