What is a K Value?

 Applies To 
 Environment: N/A
 Area: Geometry
 Original Author:Jacquelyn Pettus, Bentley Technical Support Group










What is a K-value?


The K-value is the horizontal distance required to achieve a 1% change in the slope of the vertical curve.

where L = length of curve and A = absolute value of difference in grades

"K” factors for various anticipated operating speeds are given in the AASHTO Green Book.