# 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)

• 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.