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A vertical curve is joining -4% with -2% gradient, determine the minimum length of the curve...

A vertical curve is joining -4% with -2% gradient, determine the minimum length of the curve using all applicable criteria. Speed on the curve will be 60mph. Also, find out elevations of intermediate stations on the curve for layout. The PVI is at station 31+50 and elevation 101ft. (using K-values to find the curve length)
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