Exercise 4: Adding and Modifying Superelevation Stations

In this exercise, you will resolve overlap between two superelevated curves by adding and removing critical stations, and then editing existing superelevation data.

This exercise continues from Exercise 3: Creating a Superelevation View.

Examine the superelevation parameters

1. Open Align-Superelevation-4.dwg, which is located in the tutorials drawings folder.
2. In the top viewport, zoom in to the middle of the superelevation view.

   Near station 0+558.66, the indicates that the two curves overlap. At the bottom of the superelevation view, the light blue and red lines, which represent the left and right shoulders, cross over each other.

3. In the superelevation view, select one of the lines.
4. Right-click. Click Open Tabular Editor.
5. In the Superelevation Tabular Editor, scroll down to Curve.3.

   In the Overlap column, two rows display . This icon indicates that the superelevation stations of two or more critical stations overlap. In this case, station value for the last critical station of Curve.2 is greater than the station value for the first critical station of Curve.3.

6. Under Curve.3, under Transition In Region, select the End Normal Shoulder row.

   The curve is highlighted in the bottom viewport, and the critical station is marked with a blue tick.

7. In the Overlap column, click .

   The Superelevation - Overlap Detected dialog box presents two options:

   • Automatically Resolve Overlap —This option removes the overlapping critical stations of the affected curves.
   • Ignore Overlap—This option enables you to return to the Superelevation Tabular Editor to manually modify the data. The icons are not cleared.
8. In the Superelevation - Overlap Detected dialog box, click Ignore Overlap.

Edit superelevation stations

1. In the Superelevation Tabular Editor, under Curve.2 Transition Out Region, select the Begin Normal Shoulder row.
2. Change the Start Station value to 0+560.00.

Remove a superelevation critical station

1. In the Superelevation Tabular Editor, under Curve.3 Transition In Region, select the End Normal Shoulder row.
2. Click .

   The End Normal Shoulder superelevation critical station is removed.

Add a superelevation critical station

1. In the Superelevation Tabular Editor, select the Curve.3 row.
2. Click .

   The Superelevation Tabular Editor is hidden, and you are prompted to specify a station along the alignment.

3. On the command line, enter 568. Press Enter.

   A new manual station, which starts at station 0+568.00, is displayed in the Superelevation Tabular Editor.

4. Right-click the Manual Station. Click Assign Critical Station End Normal Shoulder.
5. In the End Normal Shoulder row, enter the following values:
   Note:

   The remaining columns are interpreted from these values.

   • Left Outside Shoulder: -5.00%
   • Left Outside Lane: -2.00%
   • Right Outside Lane: -2.00%
   • Right Outside Shoulder: -5.00%
   Note:

   To import existing superelevation data from a CSV file, click .

   Notice that the icons are no longer displayed in the Overlap column.

6. Click to close the Superelevation Tabular Editor.

To continue this tutorial, go to Exercise 5: Editing Superelevation Parameters Graphically.