Getting the edge profiles is what I am looking for. How do I generate them from the travelway region(s) of the corridor? Won't I end up with circular references (i.e. parts of the corridor depending on itself)?
Also what will I get when I run cross sections and quantities using this technique? I haven't had time to experiment so I'm hoping someone can tell me if this can work before I start putting time into it.
Generating alignments and profiles from the ETW featurelines of the center corridor region does work. Adding the edge baselines and assemblies makes the corridor function as desired. However the edge assemblies do not show up in section views. This is where I got stuck before.
P.S. Well after looking closer I see that the extracted alignments and profiles are not dynamic to the centerline so it is not a solution. My next idea was to create offset alignments from the centerline at a distance equal to the width of the lanes and use these as baselines. For the profile of these offset alignments I created a surface from the center region of the corridor and sampled it for each of the offset profiles. As I suspected would happen, when I use these profiles for the edge baselines, the corridor goes into an endless loop of rebuilding.
What about a link width and slope from the center to the outside, then work you way back in?
Then set "Omit Link" to yes.
This will allow you to control the outside edges from a central profile.
As for sidewalks, we don't model them in our corridors for the reasons you mention, i.e. too many variations. We use an underlying xref with sidewalks and other non-essential-to-the-model items drawn in. That saves a lot of time. Intersections are always done with the Intersection Wizard, which is a great time saver.
Parking bays I have had partial success by attaching a LaneOutsideSuper section to the ETW of the main center assembly that targets an alignment following the parking bay. Where there is no parking, the attached lane is zero length. When bays appear, the attached lane assembly grows out to follow the alignment, then returns to zero as the bay recedes farther up the road. The problem here is that curbs look funny at the bay radii because they remain perpendicular to the centerline alignment. An offset assembly would fix that, but you need a separate profile for them and that starts to add time back into the process.
Ditches are a problem where there are lots of driveways (and, hence, culverts), as are driveways themselves. I usually model the driveways using feature lines, not assemblies. Ditches are assemblies, but as always you must start and stop them often, which means lots of regions until they come up with a better idea, like yours.
Andrew, I'm not grasping your suggestion. Could you elaborate on how it works?
I don't see any option to create dynamic links when extracting alignments or profiles from a corridor. It would solve part of the problem if we could.
While you guys may be able to get by without including sidewalks in your corridors, I find it necessary as there is often grading beyond the sidewalks that needs to be tied in, or we need to find daylight from the back of the sidewalk. I suppose we could use gradings from the back of curb instead, but if we can find a way to make this approach work it would be relatively easy to include sidewalks.
Maybe I saw it when creating Feature Lines from the corridor. I used to use that when building intersections the old way. I thought the same applied to alignments and profiles created from corridors.
In the past I have submitted a wishlist item to be able to use FLs as baselines in a corridor and have assemblies follow them just as if it were an alignment and profile. I haven't dug into 2011 yet, but I haven't heard of anything new like that being added. It would do the trick if you could. There has to be a way to keep it linked.
Now that support is added for showing multiple baselines in section views and also dynamic offset alignments, I would like to revisit this concept. I think it should work but I haven't had time to investigate. Does anyone foresee any show stoppers? I'm not sure how this would work with intersections or in superelevation scenarios.
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