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An engineer is assigned to design a vertical curve for a highway with the design speed is 70 mph. Knowing that the gradients are 3% uphill and -2% downhill. Fundamentals; Crest Vertical Curves; Sag Vertical Curves; Examples from the 2001 Caltrans Highway Design Manual. FYI – NOT TESTABLE. The 7th Edition Highway Design Manual (HDM) establishes uniform policies and procedures to carry out the state highway design functions of the California Fundamentals; Crest Vertical Curves; Sag Vertical Curves; Examples from the 2001 Caltrans Highway Design Manual. FYI – NOT TESTABLE.A.10.1 Design Guidelines for Rural and Urban Highways . considering various improvements: grade-widening vs overlay, horizontal curve. The design of vertical curves in Orange County shall meet or exceed the Caltrans Highway. Design Manual criteria. All vertical curves shall be of sufficient