Intersection Civil3d

Adapted from Mastering AutoCAD Civil 3D 2013 Chapter 11, Advanced Corridors, Intersections and Roundabouts Copyright © 2012 John Wiley and Sons Used with permission

ISBN: 978-1-118-28175-8 978-1-118-28175-8

Intersection Creation Download the zip file containing the files needed for the exercise. Extract the files to a convenient location on your hard drive before you begin. The files associated with this exercise are compatible with Civil 3D 2013 and higher. This exercise will take you through building a typical peer-road intersection using the Create Intersection wizard: 1. Open the Intersection.dwg (Intersection_METRIC.dwg (Intersection_METRIC.dwg)) file. The drawing contains two centerline alignments (USH 10 and Mill Creek Drive) that are part of the same corridor. 2. From the Home tab  Create Design panel, choose the Intersections  Create Intersection tool. 3. Using the Intersection object object snap, choose the intersection intersection of the two existing alignments. 4. When prompted to select the main road alignment, click the USH 10 alignment that runs vertically in the project. The Create Intersection – Intersection – General General dialog will appear (Figure 11.30). Figure 11.30: The Create Intersection – General dialog

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ISBN: 978-1-118-28175-8

5. Name the intersection USH 10 and Mill Creek Drive. Set the Intersection corridor type to Primary Road Crown Maintained, as shown in Figure 11.30, and click Next. 6. In the Geometry Details page (Figure 11.31), verify that USH 10 is the primary road by looking at the Priority listing. If USH 10 is not at the top of the list, use the arrow buttons on the right side to reorder the roads. Figure 11.31: The Geometry Details page of the Create Intersection wizard

7. Click the Offset Parameters button, and do the following: a. Set the offset values for both the left and right sides to 24 (8 m) for USH 10. b. Set the left and right offset values for Mill Creek Drive to 18 (5 m). c. Select the check box Create New Offsets From Start To End Of Centerlines. 

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At this step, the screen should resemble Figure 11.32. d. Click OK to close the Intersection Offset Parameters dialog.

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ISBN: 978-1-118-28175-8

Figure 11.32: Intersection Offset Parameters dialog

8. Click the Curb Return Parameters to enter the Curb Return Parameters dialog. a. For all four quadrants of the intersection, place a check mark next to Widen Turn Lane For Incoming Road and Widen Turn Lane For Outgoing Road. b. Click the Next button at the top of the dialog to move from quadrant to quadrant.

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ISBN: 978-1-118-28175-8

As shown in Figure 11.33, a temporary glyph will help you determine which quadrant you are currently modifying. Figure 11.33: Adding lane widening to the SW – Quadrant of the intersection

When you reach the last quadrant, you will see that the Next button is grayed out. This means that you have successfully worked through all four curb returns. d. Click OK to return to wizard’s Geometry Details page.

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Some locales require that lane slopes flatten out to a 1% cross-slope in an intersection. If this is the case for you, you can change the lane slope parameters in the Intersection Lane Slope Parameters dialog (Figure 11.34). In this exercise you will leave this as 2%. Figure 11.34: Lane slope parameters control the cross-slope in the intersection.

Civil 3D is performing the task of generating the curb return profile. The

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profile will be at least as long as the rounded curb plus the turn lanes that are added in this exercise. If you wish to have Civil 3D generate even more than the length needed, you can specify that in the Intersection Curb Return Profile Parameters area (Figure 11.35). Figure 11.35: Intersection Curb Return Profile Parameters options extend the Civil 3D-generated profile beyond the curb returns by the value specified.

You will be keeping all default settings in both the Lane Slope Parameters area (Figure 11.34) and the Curb Return Parameters area (Figure 11.35).

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9. Click Next to continue to the Corridor Regions page (Figure 11.36). Figure 11.36: The Corridor Regions page drives the assemblies used in the intersection.

The Corridor Regions page is where you control which assemblies are used for the different design locations around the intersection. Clicking each entry in the Corridor Region Section Type list will give you a clear picture of which assemblies you should use and where (as shown at the bottom of Figure 11.36). If your assemblies have the same names as the default assemblies, as is the case in this example, they will be pulled from the current drawing. Alternately, you can click the ellipsis to select any assembly from the drawing. If you don’t have all the necessary assemblies at this point, you can still create your intersection. Civil 3D will pull in the default set of assemblies. You can always modify these assemblies after they are brought in. 10. Click through the Corridor Region Section Type list to view the schematic preview for each. Do not make any changes to the assembly listing. 11. Click Create Intersection.

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After a few moments of processing, you will see a corridor appear at the intersection of the roads. Use the REGEN command if you do not see the frequency lines. Your corridor should now resemble Figure 11.37. Figure 11.37: The nearly completed intersection

12. Select the corridor and from the Corridor contextual tab  Modify Corridor panel, select Corridor Properties. 13. Switch to the Parameters tab of the Corridor Properties dialog and highlight one of the regions in the listing, as shown in Figure 11.38. Figure 11.38: The best way to modify regions is using the corridor properties. The selected region will highlight graphically.

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Notice how the region highlighted in the Parameters tab is outlined in the graphic. This will help you determine which region to edit, even in the largest of corridors. To move from region to region without searching through the somewhat daunting list, use the Select Region From Drawing button. In the next steps you will leverage the work Civil 3D has done for you and

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extend the intersection in all four directions. 14. Change the region start station on the west side of Mill Creek Road to 101+00 (3+200 for metric users). 15. Change the east side end station to 121+00 (3+700 for metric users). 16. Change the start station of the south end of USH 10 to 10+00 (0+300 for metric users). 17. Change the north side end station to 16+50 (0+500 for metric users). 18. Click OK and rebuild the corridor. When the corridor is complete, it will look like Figure 11.39. Figure 11.39: The completed intersection

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Intersection Civil3d

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