Problem
A +0.8% grade meets a -0.4% grade at km 12 + 850 with elevation 35 m. The maximum allowable change in grade per station is 0.2%. Determine the length of the curve.
| A. 300 m | C. 80 m |
| B. 240 m | D. 120 m |
Length of Parabolic Curve
Problem
A grade of -5% is followed by a grade of 1%, the grades intersecting at the vertex (Sta. 10 + 060). The change of grade is restricted to 0.4% in 20 m. Compute the length of the vertical parabolic sag curve in meters.
| A. 360 m | C. 300 m |
| B. 320 m | D. 340 m |
Problem 04 - Symmetrical Parabolic Curve
Problem
A highway engineer must stake a symmetrical vertical curve where an entering grade of +0.80% meets an existing grade of -0.40% at station 10 + 100 which has an elevation of 140.36 m. If the maximum allowable change in grade per 20 m station is -0.20%, what is the length of the vertical curve?
A. 150 m
B. 130 m
C. 120 m
D. 140 m
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