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The length of a vertical curve is obtained by:
  • a)
    Total change of grade - Rate of change of grade
  • b)
    Total change of grade / Rate of change of grade
  • c)
    Rate of change of grade / Total change of grade
  • d)
    Total change of grade × Rate of change of grade
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
The length of a vertical curve is obtained by:a)Total change of grade ...
Vertical Curves
  • Vertical curves are used in highway and street vertical alignment to provide a gradual change between two adjacent grade lines.
Length of a vertical curve
= (Total grade/Rate of change of grade per chain length) × Length of chain
Vertical Curves are of two types:
  • Summit Curve and
  • Valley Curve
Important Points
  • The ideal shape for the summit curve is circular because the sight distance available throughout its length remains constant. However, if the deviation angle is very small, the behavior of parabola and circular is the same. Hence, a parabola is preferred for summit curves.
  • For Valley curves, a cubic parabola is preferred as the introduction of centrifugal force on this curve is gradual and hence, there is no problem of discomfort. However, IRC suggests a Square parabola for valley curves due to the simplicity of calculation. 
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The length of a vertical curve is obtained by:a)Total change of grade - Rate of change of gradeb)Total change of grade / Rate of change of gradec)Rate of change of grade / Total change of graded)Total change of grade × Rate of change of gradeCorrect answer is option 'B'. Can you explain this answer?
Question Description
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