Using S stopping sight distance, ft
L length of crest vertical curve, ft
A algebraic difference in grades, %, absolute value
K rate of vertical curvature, ft per % change
● For a given design speed and A value, the calculated length L KA.
● To determine S with a given L and A, use the following:
For S L: S 46.45K where K L/A
For S L: S 1079/A L/2