1. Click the Edit Existing Road button if you want to edit a road you have previously created and saved. The road must already be loaded in the display.

   You will be prompted to select the road you want to edit:

   

2. When you click to select the road, the saved settings of the road are loaded and previewed in the display:

   

   You can continue to Add and Edit Parametric Steps (see below). 

To create or edit a road, specify the following Settings:

Output Layer

If you are creating a layer from scratch, use the drop-down to select an Output Layer. The segments you add to the display will be written to this layer.

Tip: You can right-click on a folder in the Layer Selection pane to Add a new layer.

Start Point

Click the ellipsis to digitise a Start Point in the Design Window. An initial segment is projected in the direction of the default Start Direction (see below).

Alternatively, use the drop-down to enter the coordinates of a known point (or adjust the coordinates of the point you have digitised).

Start Direction

Click the ellipsis to set the Bearing and the Slope of the initial segment by digitising a point.

Alternatively, use the drop-down to select a Bearing and a Slope that defines the vector.

Type

Click the drop-down to set the (Straight line or Curve) segment type. The Settings you need to specify will differ, depending on Type:

Curve

Radius

The radius of the circle the curve is moving around.

Angle

The angle of the circle to add (90° adds a quarter of a circle for example, 180° adds a half circle). See Add Quarter and Add Half below.

Grade

Click the ellipsis to set the Line Grade or Z angle between the end points of the segment by digitising a point in the Design Window.

Alternatively, enter (or use the drop-down to select) a Grade percent value.

Clockwise

Select this check box if the curve moves clockwise around the specified circle (i.e. turns left or right). Movement is counter clockwise when the check box is not selected.

Add Quarter

Click the Add Quarter button to add a quarter circle (Angle = 90° but otherwise based on the curve properties you have specified).

Add Half

Click the Add Half button to add a half circle (Angle = 180° but otherwise based on the curve properties you have specified).

Add Step

Click Add Step to add a segment based on the Curve settings you have specified. Clicking Add Step after clicking Add Quarter or Add Half, will repeat the Add Quarter or Add Half step.

Straight

Length

Click the ellipsis to set the length of the segment by digitising a point in the Design Window.

Alternatively, enter (or use the drop-down to select) a Length value.

Grade

Click the ellipsis to set the Line Grade or Z angle between the end points of the segment by digitising a point in the Design Window.

Alternatively, enter (or use the drop-down to select) a Grade percent value.

Add Step

Click Add Step to add a segment based on the Straight line settings you have specified.