This category allows you to view and edit the default tapers on the approach and departure lanes.

Design Guidelines' Road Widening 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.

Departure Taper Start

Specify the departure taper start value. This is the distance back from the intersection leg to where the taper begins. The distance is measured from the intersection point between the projected entry and exit lane road edges.

Approach Taper Start

Specify the approach taper start value. This is the distance back from the intersection leg to where the taper begins. The distance is measured from the intersection point between the projected entry and exit lane road edges.

Departure Taper Ratio

Specify the departure taper ratio value. The taper ratio is applied to the exit lane road edge.

Approach Taper Ratio

Specify the approach taper ratio value. The taper ratio is applied to the entry lane road edge.

Legend

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