Intersection sight distance - 3D analysis

Last updated: 2026-01-06

Total video time 8:34

intrsctn-sight-dist-3d-01.mp4 4:02

Add wall surface to treeline

  1. WisDOT Design tab > Design panel > Surfaces pulldown > Create Wall Surface
  2. Select Feature Line, Survey Feature, or 3D Polyline: Left-click feature line that is the treeline.
  3. Pick side to offset: Left-click on the side to offset.
  4. Enter height: 30 Enter
  5. View in object viewer
    1. Left-click on feature line
    2. Contextual ribbon > General Tools panel > Object Viewer
    3. Left-click and drag to rotate and view wall surface.
    4. Esc to end.

Add wall surface to beam guard

  1. WisDOT Design tab > Design panel > Surfaces pulldown > Create Wall Surface
  2. Select Feature Line, Survey Feature, or 3D Polyline: Left-click feature line representing the beam guard.
  3. Pick side to offset: Left-click inside
  4. Enter height: 2.3125 Enter
  5. View in object viewer

Add wall surface to proposed building

  1. WisDOT Design tab > Design panel > Surfaces pulldown > Create Wall Surface
  2. Select Feature Line, Survey Feature, or 3D Polyline: Left-click feature line representing the proposed building.
  3. Pick side to offset: Left-click inside
  4. Enter height: 20 Enter
  5. View in object viewer

intrsctn-sight-dist-3d-02.mp4 4:32

Info: Corridor top surface and existing ground surface are combined into one surface called Crdr-Ex-Top.

Run site distance analysis tool, secondary roadway looking left

  1. Ribbon > WisDOT Design tab > Analyze panel > Visibility Check dropdown > Check Intersection Sight Distance
  2. Intersection Sight Distance dialog box
    1. Left-click Decision Point select from screen button
      1. Pick decision point (eye) location: Shift + right-click > Intersection OSnap > Left-click near intersecting lines, where secondary roadway meets main roadway.
    2. Left-click Vehicle Path select from screen button
      1. Select target path (Polyline) in check direction: Left-click centerline of left lane, to the left of the intersection.
    3. Both Decision Point and Visible Point have green check marks to indicate a successful selection.
    4. Eye Height (ft): 3.5 (car)
    5. Sight Distance (ft): type 710
    6. Surfaces > Terrain Surface: Crdr-Ex-Top
    7. Surfaces > Obstruction Surfaces: Select Wall1, Wall2, and Wall3
    8. OK
  3. Impaired vision due to treeline.
  4. View in 3D
    1. Ribbon > View tab > Named Views panel > Name View dropdown > 3D
    2. Shift + mouse wheel button, to orbit and move and view site distance analysis.
  5. Return to the top view
    1. Ribbon > View tab > Named Views panel > Name View dropdown > Top
  6. Hide current site analysis
    1. Left-click on site analysis
    2. Right-click menu > Isolate Objects > Hide Selected Objects

Run site distance analysis tool, south driveway looking left

  1. Intersection Sight Distance dialog box
    1. Left-click Decision Point select from screen button
      1. Pick decision point (eye) location: Left-click a point where driveway meets roadway.
    2. Keep everything else the same.
    3. OK
  2. Impaired vision due to proposed building.
  3. View in 3D