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Q: The ideal form of the curve for the summit curve is :
  • A. Spiral
  • B. Parabola
  • C. Circle
  • D. Lemniscate
Correct Answer: Option C - In summit curve ideal form of curve is circular because the sight distance is same at every point of circular curve. But IRC prefers square parabola (or parabola) for design purpose. In valley curve ideal form of curve is cubic parabola. but IRC prefers square parabola.
C. In summit curve ideal form of curve is circular because the sight distance is same at every point of circular curve. But IRC prefers square parabola (or parabola) for design purpose. In valley curve ideal form of curve is cubic parabola. but IRC prefers square parabola.

Explanations:

In summit curve ideal form of curve is circular because the sight distance is same at every point of circular curve. But IRC prefers square parabola (or parabola) for design purpose. In valley curve ideal form of curve is cubic parabola. but IRC prefers square parabola.