This category allows you to view and edit the entry and exit lane separator lengths as well as the entry and exit transition lengths.

Design Guidelines' Lane Transitions 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.

Exit Separator Length

Specify the exit separator length value. This is the distance from a line drawn perpendicular to the leg angle line at the intersection of the leg angle and outer construction lines to the end of the separator. The leg angle line is a line projected from the center of the roundabout to where the leg reference line intersects the outer construction line (note that the leg angle line is used in the creation of the roundabout geometry but is never drawn).

Exit Transition Length

Specify the exit transition length value.

Entry Separator Length

Specify the entry separator length value. This is the distance from a line drawn perpendicular to the leg angle line at the intersection of the leg angle and outer construction lines to the end of the separator. The leg angle line is a line projected from the center of the roundabout to where the leg reference line intersects the outer construction line (note that the leg angle line is used in the creation of the roundabout geometry but is never drawn).

Entry Transition Length

Specify the entry transition length value.

Legend

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