SAG Vertical Curve Length – Connecting Descending Grades

Curves that connect descending grades forming a bowl and its design is same as crest design of vertical curves, sight distance is a major parameter in design of these curves and other parameters which are taken in account are drainage, driver comfort and sight distance.
Use this online calculator to simply your calculations.

L_{m} = 2S − { ( 200 × (H + S ×tanβ) ) / A } ∀ S>L_{m}

If S > L, then the first formula is used, if L > S, then the second formula is used.

Where,

A - Absolute difference between g_{2} and g_{1}

S - Sight Distance

L_{m} - Minimum Curve Length

H - Height of headlight

β - Angle of Headlight Beam

Curves that connect descending grades forming a bowl and its design is same as crest design of vertical curves, sight distance is a major parameter in design of these curves and other parameters which are taken in account are drainage, driver comfort and sight distance.
Use this online calculator to simply your calculations