2.0

Table Of Contents
Drawing Vertical Curves for the Finished Ground Centerline
205
The following illustration shows the parameters used in calculating a vertical
curve based on headlight data:
Drawing a vertical curve by headlight data
The following equations are used to calculate the length of curve.
If (S) is less than (L):

>@
/
$6
++ 6
u
 WDQ
D
If (S) is greater than (L):

/6
++ 6
$

§
©
¨
·
¹
¸

WDQ
D
where:
A = Absolute value of the change in grades
S = Sight distance
L = Curve length
HH = Height of headlight
D = Angle of headlight with horizontal