This category allows you to view and edit the leg lane widths, entry/exit path radii, lane offsets, kerb radii, and entry/exit widths as applicable to regional design method roundabouts.

Design Guidelines' Legs 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.

Entry Lane Width (British and French Regional Design Methods)

Specify the width value of the entry lane.

Entry Radius (French and German Regional Design Methods)

Entry Kerb Radius (British Regional Design Method)

Specify the radius value of the entry lane. This is the minimum curvature of the outside edge at the entry.

Entry Width

Specify the width value of the entry lane as it enters the roundabout.

Exit Width

Specify the width value of the exit lane as it exits the roundabout.

Exit Radius (French and German Regional Design Methods)

Exit Kerb Radius (British Regional Design Method)

Specify the radius value of the exit lane. This is the minimum curvature of the outside edge at the exit.

Exit Lane Width (French and British Regional Design Methods)

Specify the exit lane width value.

Entry Lane Offset (British and German Regional Design Method)

Specify the entry lane offset value.

Exit Lane Offset (British and German Regional Design Method)

Specify the exit lane offset value.

Entry Taper Ratio (German Regional Design Method)

Specify the entry taper ratio value.

Exit Taper Ratio (German Regional Design Method)

Specify the exit taper ratio value.

Legend

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