To Draw Tangent-Tangent Alignments With the Alignment Layout Tools

To draw an alignment using the tangent-tangent method with no curves

1. Click Home tabCreate Design panelAlignment drop-downAlignment Creation Tools Find.
2. In the Create Alignment-Layout dialog box, enter creation information.
3. On the Alignment Layout Tools toolbar, click Tangent-Tangent (No Curves).
4. Specify the start point.
5. Continue to specify points. Press Enter to end the command, or click another command from the Alignment Layout Tools toolbar.

To draw an alignment using the tangent-tangent method with curves

1. Click Home tabCreate Design panelAlignment drop-downAlignment Creation Tools Find.
2. In the Create Alignment-Layout dialog box, enter creation information.
3. On the Alignment Layout Tools toolbar, click Tangent-Tangent (With Curves).
4. Specify the start point.
5. Continue to specify points. Press Enter to end the command or select another command from the Alignment Layout Tools.

   Curves are created to comply with the values in one of the following places:

   • If the alignment has design criteria applied to it, the minimum radius for the current design speed is applied to the curve. If no solution can be found with the minimum radius value, the curve is not drawn.
   • If the alignment does not have design criteria applied to it, the default value specified in the curve and spiral settings is applied to the curve.

To insert a PI on a fixed line

1. Click Alignment tabModify panelGeometry Editor Find.
2. On the Alignment Layout Tools toolbar, click Insert PI.
3. In the drawing, pick a point near a tangent, where you want to insert the PI.

To remove a PI and combine two tangents

1. Click Alignment tabModify panelGeometry Editor Find.
2. On the Alignment Layout Tools toolbar, click Delete PI.
3. In the drawing, pick a point near the PI you want to delete.

To break apart the PI of an incoming or outgoing tangent endpoint

1. Click Alignment tabModify panelGeometry Editor Find.
2. On the Alignment Layout Tools toolbar, click Break-Apart PI.
3. In the drawing, pick a point near the PI you want to break apart.
4. Specify the distance to split the PI by picking two points or entering a value on the command line. This value is the distance each line is shortened from the PI.
5. Specify the second point.