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R-57
Edit Segment – Spiral Card
The Spiral card is used to add a spiral curve to the alignment.
Radius
: is the radius of the spiral. (This equals the
radius of the horizontal curve tangent to the spiral.)
Length
: is the length of the spiral.
Turn
: specifies if the curve turns to the
Left
or
Right
as you face the curve from the beginning.
Dir
: specifies if the curve runs from
TS to SC
(Tangent
to Spiral, to Spiral to Curve) or
CS to ST
(Curve to
Spiral, to Spiral to Tangent).
Make this segment tangent to previous
: When
checked, will automatically turn the spiral so the
beginning is tangent to the end of the previous segment.
/ : is used to specify a known
azimuth or bearing of the start of the spiral.
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