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Crest Vertical Curve Length – Connecting Inclined Roadway Sections

Crest vertical curves have been designed to connect inclined roadway sections which form crests they are easy to design only criteria is the correct sight distance, use this online calculator to length of vertical curves.

Crest Vertical Curve

To calculate Crest Vertical Curve Length:

  • Sight Distance (S)

  • Initial Roadway Grade (g1)

  • Final Roadway Grade (g2)

  • Height of driver's eye above Roadway surface (h1)

  • Height of object above Roadway surface (h2)

  •  

Results:

  • Minimum Curve Length (Lm) in meter

  • Minimum Curve Length (Lm) in foot

Formula:

Lm = ( A×S² ) / ( 200 × (√h1 + √h2)² ) ∀ S<Lm


Lm = 2S − { ( 200 × (√h1 + √h2)² ) / A } ∀ S>Lm



Where,


   

   A - Absolute difference between g2 and g1

   S - Sight Distance

   Lm - Minimum Curve Length

   h1 - Height of driver's eye above roadway surface

   h2 - Height of object above roadway surface





Crest vertical curves have been designed to connect inclined roadway sections which form crests they are easy to design only criteria is the correct sight distance, use this online calculator to length of vertical curves.