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Roads - General
Description of fields
Field
Option
Apply hori-
Check box
zontal shift/
Apply verti-
cal shift
Shift type
Linear
Constant
Parabolic
Reverse
curve
Description
When this box is checked, shifts can be
defined.
Horizontal shifts are always rectangular to
the centreline of the element being worked
with. Whereas vertical shifts are defined
along the plumb line.
a
Road_013
a
Horizontal alignment with constant
shift
b
Vertical alignment with constant shift
a
b
Road_014
a
Constant shift
b
Linear shift
c
Parabolic shift and reverse curve
The difference between the shift at the begin
chainage and the shift defined at the end
chainage is distributed in a linear fashion.
A constant shift is applied from the begin
chainage of the shift to the end chainage of
the shift. The shift stays the same from its
start chainage or station to the end chainage
or station.
Available for Road and Rail. The difference
between the shift at the begin chainage and
the shift defined at the end chainage is dis-
tributed using a cubic parabola. Parabolic
shifts allow a smooth transition between the
existing curve and the shifted part.
Available for Road and Rail. Two arcs with the
same radius are used to distribute the shift.
As for parabolic shifts, reverse curves guaran-
tee a smooth transition between the existing
curve and the shifted part.
b
c
681
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