Learning Goal: I’m working on a civil engineering question and need an explanation and answer to help me learn.

Consider a segment of highway composed by a horizontal curve and a sag curve(equal-tangent). Both curves have the same design speed. The horizontal curve hasa superelevation ?=0.08, central angle of Δ=30°, and a PT atstation???(??)=302+20. Theroad has two 11-ft lanes (one in each direction).For the sag curve,the initial grade is?1=−1.8%and the final grade is ?2>0.0%(the exact value of ?2is unknown). The station of the PVC is ???(???)=232+70, and thestation of the low point of the sag vertical curve is ???(????????)=235+14.8.

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