• Civil 3D

Split a corridor and create a road intersection

Split a corridor into segments and then create an intersection in Civil 3D.


00:03

Civil 3D provides tools for automatically generating intersections

00:08

where two or more alignments cross.

00:11

They can be used to create standard three- and four-way intersections and roundabouts.

00:17

Intersections update dynamically when changes are made to the connected alignments or profiles.

00:23

They are made up of customizable components

00:25

such as lane configurations, curb returns, and grading slopes

00:30

that make it easy to design for compliance.

00:33

Also, intersections are integrated into the corridor model,

00:37

ensuring seamless connections between road segments and across the road network,

00:42

as well as accurate earthwork calculations.

00:45

After you have a corridor modeled, you can split it into two or more segments,

00:50

and then add the necessary intersections.

00:53

Once the intersection is ready to be evaluated,

00:56

you can use several visual and analytical tools in Civil 3D

01:00

to evaluate the intersection for sight distance.

01:04

In this example, a corridor has already been created in the open Civil 3D drawing.

01:09

The first step is to split the corridor into segments to create space for the intersection.

01:15

In the drawing, select the corridor model.

01:18

Then, from the contextual ribbon, Modify Region panel, click Split Region.

01:26

The program prompts you to select the region of the corridor to split.

01:30

In the drawing, select the region, and then select the specific split location.

01:36

Now, zoom in to the selected point and use the grips to create an opening by dragging the arrow,

01:43

making space for the intersection to be modeled.

01:47

Ensure that both alignments intersect each other,

01:51

zooming in to examine the intersection closely.

01:55

If needed, extend the alignment beyond the main alignment

01:58

to make sure that there is a definite intersection.

02:02

Now that you have a definite intersection and a profile for both the main road and the side road,

02:08

you can build the intersection.

02:11

From the ribbon, Home tab, Create Design panel, expand Intersection and select Create Intersection.

02:19

In the drawing, zoom in and select the point where the alignments intersect.

02:24

Then, you are prompted for the main road alignment.

02:28

Press ENTER to open the Select alignment dialog.

02:32

Select the appropriate alignment, and then click OK.

02:37

The Create Intersection wizard opens.

02:41

Specify the intersection name, marker style, and label.

02:46

Then, expand the Intersection corridor type drop-down

02:50

to select whether the intersection corridor should maintain the primary road crown or all crowns.

02:57

Select each option to update the preview, and in this case, select All Crowns Maintained.

03:04

Click Next to set the offset parameters.

03:08

If you want the offset roads to follow existing alignments,

03:12

you can specify them here.

03:14

In this case, skip this step.

03:16

Click Next to choose the assemblies to apply.

03:20

If you previously created assemblies for that intersection, you can use those,

03:25

or you can use the default assemblies suggested, as in this case.

03:30

Click Create Intersection.

03:33

The wizard closes, and after a moment, the drawing updates to display the intersection.

03:39

If the labels are overlapping, click and drag them out of the way for a better view,

03:44

to ensure that the intersection appears correct.

03:48

Here, you could connect the road on the right to the intersection,

03:52

but leaving a gap will enable a smoother transition between the point codes and daylights

03:57

when creating the surface from both corridors.

04:01

Now you know how to split corridor segments and create intersections in Civil 3D.

Video transcript

00:03

Civil 3D provides tools for automatically generating intersections

00:08

where two or more alignments cross.

00:11

They can be used to create standard three- and four-way intersections and roundabouts.

00:17

Intersections update dynamically when changes are made to the connected alignments or profiles.

00:23

They are made up of customizable components

00:25

such as lane configurations, curb returns, and grading slopes

00:30

that make it easy to design for compliance.

00:33

Also, intersections are integrated into the corridor model,

00:37

ensuring seamless connections between road segments and across the road network,

00:42

as well as accurate earthwork calculations.

00:45

After you have a corridor modeled, you can split it into two or more segments,

00:50

and then add the necessary intersections.

00:53

Once the intersection is ready to be evaluated,

00:56

you can use several visual and analytical tools in Civil 3D

01:00

to evaluate the intersection for sight distance.

01:04

In this example, a corridor has already been created in the open Civil 3D drawing.

01:09

The first step is to split the corridor into segments to create space for the intersection.

01:15

In the drawing, select the corridor model.

01:18

Then, from the contextual ribbon, Modify Region panel, click Split Region.

01:26

The program prompts you to select the region of the corridor to split.

01:30

In the drawing, select the region, and then select the specific split location.

01:36

Now, zoom in to the selected point and use the grips to create an opening by dragging the arrow,

01:43

making space for the intersection to be modeled.

01:47

Ensure that both alignments intersect each other,

01:51

zooming in to examine the intersection closely.

01:55

If needed, extend the alignment beyond the main alignment

01:58

to make sure that there is a definite intersection.

02:02

Now that you have a definite intersection and a profile for both the main road and the side road,

02:08

you can build the intersection.

02:11

From the ribbon, Home tab, Create Design panel, expand Intersection and select Create Intersection.

02:19

In the drawing, zoom in and select the point where the alignments intersect.

02:24

Then, you are prompted for the main road alignment.

02:28

Press ENTER to open the Select alignment dialog.

02:32

Select the appropriate alignment, and then click OK.

02:37

The Create Intersection wizard opens.

02:41

Specify the intersection name, marker style, and label.

02:46

Then, expand the Intersection corridor type drop-down

02:50

to select whether the intersection corridor should maintain the primary road crown or all crowns.

02:57

Select each option to update the preview, and in this case, select All Crowns Maintained.

03:04

Click Next to set the offset parameters.

03:08

If you want the offset roads to follow existing alignments,

03:12

you can specify them here.

03:14

In this case, skip this step.

03:16

Click Next to choose the assemblies to apply.

03:20

If you previously created assemblies for that intersection, you can use those,

03:25

or you can use the default assemblies suggested, as in this case.

03:30

Click Create Intersection.

03:33

The wizard closes, and after a moment, the drawing updates to display the intersection.

03:39

If the labels are overlapping, click and drag them out of the way for a better view,

03:44

to ensure that the intersection appears correct.

03:48

Here, you could connect the road on the right to the intersection,

03:52

but leaving a gap will enable a smoother transition between the point codes and daylights

03:57

when creating the surface from both corridors.

04:01

Now you know how to split corridor segments and create intersections in Civil 3D.

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