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Topic

Vertical Design · Question 1

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A. Equal-tangent parabola geometry & elevations

On a rural highway cresting a ridge, an equal-tangent vertical curve joins a $+3\%$ grade to a $-2\%$ grade over $L=600$ ft. Its PVI is at Sta 48+00.00, elevation 853.20 ft. The finished roadway elevation at Sta 47+80.00 is most nearly:

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