To Add Floating Lines and Spirals to Alignments

Add floating lines with spirals in situations where you need a spiral transition to a line that is defined by either a pass-through point or length.

To add a floating line with a spiral (from curve, through point)

Add a floating spiral-line group, with a specified spiral length and pass-through point, to a curve.

When the attachment entity (1) is edited, the spiral length (2) and pass-through point (3) do not change. The line length and attachment point change to accommodate edits to the attachment curve.

1. Click the alignment. Click Alignment tabModify panelGeometry Editor.
2. On the Alignment Layout Tools toolbar, click Floating Line With Spiral (From Curve, Through Point).

   The current spiral definition is displayed at the command line.

3. Specify the curve end to attach to.
4. Specify either the spiral length or the A value, either by entering a numeric value, or selecting two points in the drawing.

   Specify a new value, or press Enter to accept the value that is displayed on the command line.

   • If the alignment has design criteria applied to it, the minimum value for the current design speed is displayed.
   • If the alignment does not have design criteria applied to it, the default value specified in the curve and spiral settings is displayed.
5. Specify the pass through point.

To add a floating line with spiral (from curve end, length)

Add a floating spiral-line group, with specified spiral and line lengths, to a curve.

When the attachment entity (1) is edited, the spiral (2) and line (3) lengths do not change. You can adjust or move the attachment curve and the entire spiral-line group moves with it.

1. Click the alignment. Click Alignment tabModify panelGeometry Editor.
2. On the Alignment Layout Tools toolbar, click Floating Line With Spiral (From Curve End, Length). The current spiral definition is displayed at the command line.
3. Specify the curve end to attach to.
4. Specify the spiral length or the A value, by either entering a numeric value or selecting two points.

   Specify a new value, or press Enter to accept the value that is displayed on the command line.

   • If the alignment has design criteria applied to it, the minimum value for the current design speed is displayed.
   • If the alignment does not have design criteria applied to it, the default value specified in the curve and spiral settings is displayed.
5. Specify the line length.