Generate various types of sight lines in the drawing and allows the existing sight lines to be edited and removed. A sight line is a line of sight from a driver's eye to an object or area located at a distance which is sufficient for the driver to see and safely react to potential conflicts. Sight line analysis is important for determining safety constraints in a roundabout.

Note:

• The sight lines are drawn as separate blocks outside the roundabout. However, updating the roundabout updates the sight lines as well.
• The Evaluate Sight Lines tool can only be applied to roundabouts generated using the vehicle envelopes based design guidelines.

For an example of how the Evaluate Sight Lines tool works, please play the Evaluate Sight Lines tutorial (for information on how to play a tutorial, see Tutorials -> Play).

Evaluate Sight Lines Dialog Box

Error Notification

Indicates an error in generating the sight line. If a sight line cannot be generated, its name will be preceded by the graphic in the list. To find out what caused the error, move your mouse over the corresponding graphic and read the tooltip that will display.

Draw

Turns a sight line on/off. By default, a sight line added to the roundabout is drawn in the drawing.

Note: If you have added all sight lines (Add All Default Sight Lines), the sight lines will not be drawn in the drawing.

Sight Line Type

Displays the type of the sight line.

Approach Leg

Displays the name of the approach leg for which the sight line was generated.

Evaluate Sight Lines Tools

Button	Option	Click to...
	Add Sight Line	Add sight lines individually.
	Edit Sight Line	Edit the selected sight line.
	Delete Sight Line	Delete the selected sight line.
	Add All Default Sight Lines	Add all sight lines at once using the settings specified in Design Guidelines' Sight Lines Category. By default, the sight lines are not drawn. Turn them on/off by clicking the Draw button.