Spectra Precision Survey Pro v4.5 Ranger Reference Manual - Manual (Page 421)

Roads Menu
R-413
Add / Edit Super Elevation Screen
Roads Edit Roads (New… or Edit…) Super Elevations (Add… or
Edit…)
The Add / Edit Super Elevation screen allows you to add a super
elevation to the road or edit an existing super elevation.
Start Station: is the location of the beginning
of the super elevation on the alignment.
Length / End Station : is the length of the
super elevation measured from the Start
Station
, or it is the end station, depending on
how the button is toggled.
Note: Keep in mind that the slope at the end of
a super elevation will continue down the road
unless another super elevation is entered to
change the slope back again. For example, a
curve will typically require two super elevations for each side of the
road: one at the beginning of the curve and one at the end.
Slope 1 / 2: is the starting and ending slopes of the road, respectively.
The starting slope must match the current slope of the road at that
station.
Parabolic Transition 1 / 2: is the length of the vertical curve that
will lead in and out of the super elevation, respectively. Parabolic
transitions are optional parts of a super elevation and result in a
smoother change going into and coming out of a super elevation,
similar to how a spiral curve is used with a horizontal curve.
Note: One half of the parabolic transition length will extend before
and after the starting point and/or the ending point of the super
elevation. This should be considered when using parabolic
transitions near the end of an alignment since this length cannot
extend beyond the limits of the road.