Product Manual

Table Of Contents
Element Description
TSOX_112
A
B
A Entry spiral
B Exit spiral
For onboard input Road 3D supports the following elements for vertical alignments.
Element Description
Straight A straight has to be defined by:
Start chainage and start height of P1.
End chainage and end height of P2, or length (L) and slope (%).
TSOX_113
P2
P1
P1
-%
L
P2
+%
L
P1 Start point
P2 End point
L Length
% Slope
Transition
curve
A circular curve has to be defined by:
Start chainage and start height of P1.
End chainage and end height of P2.
Radius (R).
Type: Convex (crest) or Concave (sag).
T
SOX_051
P1
R
a
R
P2
P1
RR
P2
b
a Convex
b Concave
P1 Start point
P2 End point
R Radius
Quadratic
parabola
A quadratic parabola has the advantage that the rate of change of grade is
constant, resulting in a "smoother" curve. A quadratic parabola has to be
defined by:
Start chainage and start height of P1.
End chainage and end height of P2.
Parameter, or Length (L), grade of entry straight (GradeIn) and grade
of exit straight (GradeOut).
T
SOX_114
P1
+%
-%
P2
L
Vertical geometry ele-
ments
96 Applications