00:09We have four alignments that we will use as examples. For the eastern alignment,
00:14we can lay out the tangent section based on the points of intersection, but we also want to include
00:19a reverse curve that we can easily edit. In the south alignment, we want to import the alignment
00:27based on the line work that is drawn using polylines. It also contains a reverse curve,
00:33but we want to pay attention to the direction that we draw the alignment since that will dictate the
00:37direction of the stationing. The west alignment is very basic, but we want to include spirals in the
00:44curve. In this video series, we will also detail the intersection of the end alignment. For the north
00:53alignment, we want to import an XML file that may be designed by someone else or possibly in another
00:59program. So to begin with, we will lay out the east alignment with the reverse curve. We will provide
01:06the alignment name and some of the key parameters such as the stationing and the design speed as
01:11well. Now to lay out the reverse curve, we will draw a tangent between the beginning point and the first
01:17PI. We will do the same thing for the end section of the alignment, but the first curve we will
01:24enter
01:24in as a floating curve, and we can select any point on the first tangent. Then we enter the radius,
01:31and then we select the through point. In this case, we can choose any point on our layout line,
01:36and we will just choose the nearest. Now the alignment then updates to include that curve.
01:43Next, we want to add a second curve as a free curve. We will select the first curve and the
01:50second
01:50tangent, and then specify that this is a reverse curve. Once we add the radius, our alignment is
01:58now complete. We can modify the geometry by moving the grips, and we can see that the reverse curve
02:04stays true. This option gives us much more flexibility if anything on the alignment needs to change or be
02:11revised. Next, we will create an alignment from objects, and when we do this, the alignment will
02:19reflect the exact geometry that we have drawn. We want to be certain that we have laid out the curves
02:25correctly, and we need to be aware of the direction in which the line was created. To be consistent with
02:31the other alignments, we will start at the intersection point and move south, and here we are simply laying
02:36out a polyline by drawing points at each PI. Then we will run the fillet command at each curve, and
02:45then
02:45add a reverse curve near the northern portion of the alignment. Now to create the alignment, we need to
02:53choose create alignment from objects from the alignment drop down. Initially, we can specify the direction of
03:00the stationing, or if we want to reverse the stationing on how it was drawn. And then here we can
03:05define the
03:06design criteria similar to the previous alignment. Stationing, design, speed, other items like that.
03:11Now once the alignment from objects is created, there are a few things that we need to consider.
03:16Simple geometry like curves, points, or tangents, those can easily be updated using the grips or tools.
03:25Complex geometry like compound or reverse curves are essentially set by the objects. Here, if we
03:32revise the reverse curve, a warning will display showing the elements are not collinear. And in this
03:38case, we could redraw the object or lay out the alignment similar to the first method. Next, we have
03:44a very simple alignment where we would like to add spirals. We take the same steps that we did previously
03:50to set up the alignment and lay out the points. Now here, we will choose the free spiral curve
03:56spiral function and lay out the curve in the standard method, where we select the tangents
04:02and specify the radius. But we also need to indicate the spiral length on both sides of the curve.
04:09Now there are other ways that we can add spiral curvature, and it's something that users can play with
04:13to see all the capabilities of that tool. Now for the north alignment, we have a simple layout,
04:19but we want to import the XML file that contains the geometry for the alignment. We do this under
04:25the Insert tab and choose Land XML. One item to note is that Super Elevation is supported for Land XML
04:32files. Here we can choose which items we would like to import into our file. So we'll choose all the
04:38available elements there. Now once we've imported that, we have the same editing capabilities. In viewing
04:44the alignment, we'll see that the stationing may need to be updated. So we can do this by selecting the
04:49alignment and choosing properties. Here we can change the stationing or other design criteria,
04:55or even add station equations if we need them. The alignment grid view is available for any
05:00civil 3D alignment. So when we choose this function, we can see the detailed geometry,
05:05and we also have the ability to revise the alignment. This gives us a level of precision
05:10to modify the alignment exactly as is required by our design criteria.
05:15So the last portion of this segment that we'll cover is for offset alignments. And we would like to
05:21create a corridor with an intersection between the south alignment and then this access road here.
05:27The northbound portion of the road will have a turn lane, but that turn lane crosses the centerline
05:33alignment. And the same is true for the southbound approach of the intersection. The lane overlaps the
05:40alignment. So in order to create a corridor, we will need an offset alignment for the northbound and
05:46southbound lanes that can govern the assemblies. So in order to do this, we go to the alignment menu and
05:53choose create alignment offset. And we'll base this on the centerline. We need to provide some details
05:59about the offset alignment. So we'll create the northbound alignment first. So one thing we need to
06:04consider, again, is the direction of our stationing. The stationing goes from north to south. So the
06:10northbound is actually on the left side of the alignment. So we'll recreate only the northbound
06:15alignment for now. And so we'll need to zero out the southbound side and then set the properties.
06:20And we won't set the labels right now. If we have a profile for the centerline, we can base the
06:25offset
06:25alignment profile on that centerline and then provide an offset slope. The offset was created,
06:35but we're showing the line only. No labels. And we can change the alignment definition if needed.
06:40In our tool space, we can select the alignment and choose properties. And we have several options
06:44to define our alignment. If we want to group this with the other centerlines, we can define that here.
06:52We'll do the same thing for the southbound lane. We'll define it on the right side relative to the
06:57stationing. And then we'll set up the similar parameters.
