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Summit curve: A vertical curve was designed to connect intersecting tangents of grades of 4% and - 6% for back and forward tangents respectively. The vertical offset at the midpoint of curve is 3.75m. 7. Determine the length of curve. a) 400m b) 300m c) 200m 8.Determine the the change in grade at the Pl. a) 2% b) -2% c) 10% d) -6% A parabolic curve having a forward tangent of -3% intersects a back tangent of +6.5% at station 10 + 800 whose elevation is 250. 60 m. The length of the curve is 400 m. 9. The stationing of the highest point of curve. a) 10+637.46 b) 10+845.37 c) 10+873.68 d) 350m 10. Determine the elevation of the highest point. a) 245.85m b) 246.50m c) 256.78m d) 10+784.35 d) 263.56m