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Table Of Contents
Chapter 3 Working with Profiles and Vertical Alignments
200
The following illustration shows the parameters used in calculating a vertical
curve based on minimum passing sight distance:
Drawing a vertical curve by passing sight distance
The following equations are used to calculate the passing sight distance.
If the safe passing distance (S) is less than the length of the curve (L):
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If (S) is greater than (L):
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where:
L = Length of vertical curve in feet
S = Sight distance in feet
A = Algebraic difference in grade percent
h
1
= Height of eye above alignment surface in feet
h
2
= Height of object above alignment surface in feet