This category allows you to view and edit the construction triangle’s base, distance, offset, height, and connecting radius.

Design Guidelines' Construction Triangle Category Dialog Box

In the dialog box, move the mouse pointer over the controls to view the associated tooltip and then reference the controls described below.

Note: For the purposes of describing the software, it is assumed that Right-Hand Traffic is selected under Traffic Direction in Design Guidelines' General Category. If Left-Hand Traffic is selected, the descriptions with references to a right/left turn path should be interpreted in the opposite direction.

Triangle Base

Specify the triangle base value in the box or clic Calculate Triangle Base and then specify a factor to calculate the value or vice versa.

Triangle Distance

Specify the triangle distance value in the box or click Calculate Triangle Distance and then specify a factor to calculate the value or vice versa.

Triangle Apex Offset

Specify the triangle apex offset value in the box or click Calculate Triangle Apex Offset and then specify a factor to calculate the value or vice versa. In addition, there is an option to modify the basic offset constant (the default value is 0.25 m) by typing the desired value in the Add a basic offset of box. Increasing or decreasing, the value will shift the construction triangle to the left or to the right of the reference geometry respectively.

Triangle Height

Specify the triangle height value in the box or click Calculate Triangle Height and then specify a factor to calculate the value or vice versa.

Connecting Radius

Specify the connecting radius value in the box or click Calculate Connecting Radius and then specify a factor to calculate the value or vice versa.

Legend

For a description of the elements drawn in the roundabout in this category, see Roundabout Illustration Legend.