Applies To
	Product(s):	InRoads
	Version(s):	08.11.07.615
	Environment:	N/A
	Area:	Geometry
	Subarea:
	Original Author:	Jacquelyn Pettus, Bentley Technical Support Group

 

 

 

 

 

 

 

 

Question

What is a K-value?

Answer

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

K=L/A
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.