# To define additional strings

Use Additional strings to define features that are related to but separate from the road, such as sound barriers or storm water drains. The additional string is defined by horizontal geometry comprising a series of lines that are defined relative to the horizontal alignment of the road and, if required, vertical geometry defined using all the options available when defining a vertical alignment for a road.

To add additional strings to the selected road definition:

1. Tap Additional strings.
2. Tap Add.
3. Enter the String name. Tap Accept.
4. To define the horizontal geometry of the string:
   1. Tap Horizontal geometry. If required, tap Edit.
   2. Tap Add.
   3. Enter the Station and Offset to define the start point. Tap Store.
   4. Enter the End station and Offset for the line. Tap Store.
   5. Continue adding lines to define the string as required.

   6. When you are done, tap Close.

5. Tap Accept.
6. To define the vertical geometry of the string:
   1. Tap Vertical geometry.
   2. Tap Add.
   3. Enter the Station (VPI) and Elevation (VPI) to define the start point. Tap Store.
   4. Add the required elements to the vertical geometry. See To key in the vertical alignment.

   5. When you are done, tap Close.

7. Tap Accept.
8. Add another string, or tap Accept to return to the list of components for the selected road definition.
9. Enter the other road components or tap Store to store the road definition.