00:09This is the alignments, profiles, and assemblies we developed previously to create the corridor model.
00:15We will demonstrate a few procedures when modeling the corridor that we can implement on other projects.
00:22Before we get into the corridor, there are a few details that we need to verify regarding our assembly.
00:28We need to be sure that we have enabled superelevation for the lanes.
00:32We can select the lane and specify that we want to use superelevation.
00:37And for each lane, we can identify if the lanes are left or right, or inside or outside.
00:43We can also determine the direction of the slope, either toward the crown or away from the crown.
00:49This will depend on our assembly configuration and the method of superelevation used in the corridor.
00:57The next item to consider prior to creating a corridor is to apply superelevation to the alignment.
01:04First, we need to apply a design speed to that alignment if we have not already done so.
01:09Here, we set the design speed at 45 miles an hour.
01:13We will select the alignment again and choose superelevation from the menu.
01:17And we can choose to calculate now.
01:19We have a few choices for this corridor.
01:22In this case, we will choose divided crown with median.
01:25We can also modify the pivot method.
01:28For this, we'll choose the center where the crown will be between the two lanes.
01:32Next, we'll define the number of lanes and the lane widths.
01:36And then we can also control the outside shoulder and the superelevation criteria.
01:40And we will choose the library that is included with Civil 3D.
01:43But we could choose a custom file here if we needed to.
01:47When the calculation is complete, we can view the results and modify the stations and slopes if needed.
01:54We can also see that those items have been labeled in plan view.
01:57Now, let's jump into the corridor.
01:59Here, we'll specify the name, which baseline alignment we want to use, the profile, and the assembly that we'll use
02:06in the corridor.
02:06We'll choose the target surface and then select OK.
02:10Now, keep in mind, we can modify any of these items later on if we need to.
02:14Within the corridor parameters, we will set up items like the frequency of the sections and some of the key
02:21targets.
02:22In frequency, one of the items that I like to choose is to apply by curvature to the curves.
02:28This helps to model the corridor more accurately and avoids a segmented look in tighter areas.
02:34Our surface is already defined for our target.
02:37And in this case, we don't have any feature lines or alignments to define our pavement lines.
02:42Once we run the corridor, we want to inspect it and make any necessary revisions.
02:47We can view it with the section editor.
02:49This gives us plan, profile, section, and assembly view of the corridor.
02:55And we can also modify these windows, but for now, we'll use this format.
02:59So in the curves section, we see that we have defined our assembly lanes incorrectly by looking at the superelevation.
03:07So we can fix that easily by redefining the parameters in the assembly.
03:11In this case, we need to make it toward the crown instead of away.
03:15Then we rebuild the corridor, and those lanes look much better.
03:20Now let's look at some of the other areas of the corridor and verify that they're correct as well.
03:26And those also look pretty good.
03:28So let's change the viewport configuration to three windows so that we can zoom in on the section view.
03:34By zooming in, we see that that looks pretty good.
03:36So we can move on to the next corridor.
03:38So we want to model this access road so that we can eventually set up the intersections for the other
03:44corridors.
03:45For the purposes of this demo, we won't use superelevation on this segment, but we would do the same thing
03:51that we did previously.
03:52We'll apply the assembly with the retaining walls for this corridor.
03:57And then we'll define the corridor elements and update the frequency.
04:03Here we actually want to divide some of the regions near the intersection.
04:07So we'll turn off the target surface at the intersection.
04:11So once those are all set, we'll run the corridor.
04:14And now we'll view the results using the section editor here as well.
04:20Once we have these corridors, let's add the east and west alignments.
04:25We'll add superelevation as an undivided crowned roadway this time.
04:30Similar steps as the previous alignment by defining some of these items for the calculation.
04:36And with a reverse curve, Civil 3D has identified a number of conflicts or overlaps in the superelevation calculation.
04:43So we can either manually adjust these stations or we can select these, right click on them, and choose automatically
04:50resolve overlap.
04:52And then these values will be recalculated to accommodate the reverse curve.
04:56And then we'll also calculate the superelevation for the east alignment.
05:01Now in this corridor, there are a few items that we want to do that are slightly different than the
05:05previous corridors.
05:06We will choose the west alignment as the baseline and the west assembly.
05:11Then we'll split the region up as we did previously.
05:15And then update those targets.
05:17And once we have that, let's run that so that we can view the limits.
05:21And this seems to be okay for now.
05:22We have quite a bit of cut in this particular section.
05:24But let's go back into the corridor parameters and add the east alignment.
05:30And we'll do this by adding a baseline.
05:33So we need to determine the profile and the assembly for this baseline.
05:38And for this part, we'll add the east assembly.
05:41And we can split the regions here as well.
05:46Then rerun the corridor.
05:49As we did before, we can check the results in the section editor.
05:53So it looks like we do need to make some changes and then rebuild the corridor.
05:59In cases where we need to redefine the assembly parameters, we can right-click on the assembly and go to
06:05the assembly properties.
06:06This window gives us the same ability to edit the sub-assemblies as the properties window.
06:11So if the section looks incorrect, we'll likely need to modify the superelevation, either inside or outside.
06:18Or we'll need to modify the slope direction.
06:20And that looks to be correct now.
06:23We then choose the other baseline that we want to track along and then view those results.
06:30Again, we can make any needed corrections as we move along the corridor.
06:37Everything looks to be in good order here.
06:39So let's move to the next one.
06:41Now, the next corridor utilizes the offset alignments that we created previously.
06:46So we want to use feature lines or polylines to control the raised median locations.
06:52We could use alignments, but this line work will be sufficient.
06:56So we set up the assembly previously with a link between the southbound and the northbound lanes with a median
07:03and with median turn lanes.
07:05We also really need to note the direction of the stationing.
07:09In this case, southbound is on the right side of the assembly.
07:14Once we've set those items previously discussed, such as frequency and targets, we can now focus on some of the
07:22other targets.
07:23This is where identifying the lane names is critical.
07:26First, we'll set the offset alignment as the northbound offset alignment and the profile as the northbound offset alignment profile.
07:36So let's run the corridor now to verify that we're in the right place with the alignments and with the
07:43lanes.
07:43So by inspection, those look to be pretty good.
07:46We also have an additional assembly without the raised median that we intend to use near the intersection.
07:52So we can split the regions and then set the corridor with the additional assembly.
07:59For the median control lines, we'll choose items from our drawing.
08:07Here we can pick the polylines that represent the median on both sides.
08:12This is where knowing our right and left lanes and the southbound and northbound lanes is vital.
08:20So the median looks to be pretty good.
08:22Looks like it's modeled it fairly well.
08:24We will need to update the intersection area, but for now the region looks okay.
08:30South of the intersection, we'll do the same thing where we identify the control lines with polylines from our drawing.
08:38Now at the end of the corridor, we extended past the median.
08:41We can truncate this by revising the region station limits.
08:46And now that looks pretty good too.
08:49Now in the section editor, we want to look at the transition areas to ensure that our assembly is behaving
08:54correctly.
08:55The median looks pretty good.
08:57But we do have a gap near that intersection.
09:00We can resolve this in a couple of ways.
09:02We can either create polylines between the sections to target horizontally.
09:07But one thing that we need to consider is the elevation.
09:11The assembly will target this in plan view, but it will project the slopes as they are set.
09:17And in this case, we can see that we are off.
09:19The other way that we can resolve this is to use the centerline alignment as a horizontal and vertical control.
09:28So once we set that, we can inspect the section view.
09:33And that has been drawn correctly.
09:34And we can even see that it has corrected the slope to the target centerline alignment and filled in those
09:40gaps nicely.
09:41The final element is the turn lane for the northbound side.
09:45And we have a polyline that represents the edge of travel lane that we'll include in the corridor.
09:50Again, we need to pick the lane that will target the line.
09:53Then we select the line from our CAD file and we rebuild the corridor.
09:57The section view shows the lanes nicely.
10:00So these are some of the typical methods for creating corridors.
10:05Oftentimes, we'll have to use a combination of these workflows together.
