Locate Corridor or Alignment

Selecting a Corridor will use the corridor's alignment as the Control Alignment for the command. All stationing will be relative to this control alignment. This will also cause the analysis to use the corridor's top mesh as the Design Surface and there will not be a later prompt to Locate Design Surface.

Selecting an alignment causes the selected alignment to be used as the Control Alignment for the tool. In this case, the user will be prompted later to Locate Design Surface.

Locate Eye Control Alignment-Reset for Main Alignment

Selecting an alignment to control the Eye positions causes the Eye position's XY location to be calculated by projecting the station along and perpendicular to the Main Control Reference onto the selected Eye Control Alignment. The offset is applied relative to the selected eye control alignment.

Resetting For Main Alignment to control the Eye positions causes the Eye position's XY location to be calculated directly from the Main Control Alignment. The offset is applied relative to the Main Control Alignment.

Locate Object Control Alignment-Reset for Main Alignment

Selecting an alignment to control the Object positions will cause the Object position's XY location to be calculated by projecting the station along and perpendicular to the Main Control Reference onto the selected Object Control Alignment. The offset will then be applied relative to the selected object control alignment.

Resetting For Main Alignment to control the Object positions causes the Object position's XY location to be calculated directly from the Main Control Alignment. The offset is applied relative to the Main Control Alignment.

Start Station <Alt> Lock To Start

Select the location of the first Eye Position to be analyzed. Selecting a start station location causes a temporary sight line to be shown to the user. This temporary sight line is only used to help the user visualize where the Eye and Object positions are going to be when the sight line is analyzed. It does not dynamically analyze the sight distance.

<Alt> Lock To Start

Locks the start station to the start of the control alignment.

End Station <Alt> Lock To End

Select the location of the last Eye Position to be analyzed.

<Alt> Lock To End

Locks the end station to the end of the control alignment.

Locate Design Surface

Select the surface to be used as the design surface. Later in the command's prompt sequence a prompt displays to locate an existing surface. During the analysis of a sight line, if no existing surface was specified the design surface will be the only surface used to determine if the sight line achieves the required sight distance. If a corridor was initially selected, there will not be a prompt for Locate Design Surface.

Locate Existing Surface-Reset to Skip

Select the surface to be used as the existing surface. If an existing surface is selected and it is not the same as the design surface, the analysis ignores intersections with the existing surface if they are within the bounds of the selected design surface. If you reset to skip the existing surface the analysis will check only for intersections with the selected design surface. Likewise, if an existing surface is selected and no design surface was selected, the analysis will check only for intersections with the selected existing surface.

Make sure that the Move Target check box is set to your desired analysis type. Remember, when Move Target is On a sight line for each Object Position Interval is analyzed until the Required distance is either achieved for that Eye Position or an intersection with a design or exiting terrain or mesh is found. In the case where an intersection is found and the Required Sight Distance has not been achieved, the analysis displays the last successful sight line for that eye position. When Move Target is Off only one object position for a given eye position is analyzed and the object position will be down range from the Eye Position along the Object Position's Reference Alignment a distance equal to the Required Distance as measured along the Main Control Alignment.

• Data point to accept the Settings File.
• Data point to accept the Visibility Type.
• Data point to accept the Speed.
• Data point to accept the Required Distance.
• Data point to accept the Relaxed Distance.

The Results dialog box appears and the analyzed sight lines appear in the 3D model. The sight lines are visible also in the 2D model if the 3D model is attached to it. They are not individual alignments. They are a group of transient lines whose display is controlled by the check boxes (Achieved, Relaxed and Not Achieved) on the Results dialog.

On the right side of the Results dialog is an arrow to Show or Hide Extended Properties.

Also a Report icon displays the Report Browser and a default report with additional information not shown in the Results dialog.

The Results dialog for a given Sight Visibility section can be accessed via the Explorer or by the fly-out menu shown when the sight lines are selected in the 3D model.

The Show Selected check box displays the sight lines of only the row or rows selected. Use the Up/Down arrows to display the row that is selected in the Results dialog box. When Off the previous status of the check boxes for Achieved, Relaxed and Not Achieved is reinstated.