Equation Value Ahead Or Back Option
The Equation Value option and the Ahead/Back values are only applicable when labeling the station equation points. Station equation points are unique because they require labeling both the back and ahead stations on a single point.
Note: The Ahead or Back options are only applicable when labeling
other points, such as PC, PT, and so on. All other points use the actual station of
the alignment at that location, taking into consideration all station
equations.