Portion of Corridor Surface Disappearing with New Baseline

So, I've built quite a large corridor that covers all roads and a decent amount of lot grading for the first phase of a subdivision.

I'm now creating alignments and design profiles for cul-de-sac curb lines and adding corridor baseline/regions to grade the cul-de-sacs.

I've done 3 cul-de-sacs no problem. The latest one though... when the new baseline/region is applied it builds the corridor perfectly, but the corridor surface disappears in for the area governed by the cul-de-sac baseline and the main street region that this cul-de-sac connects to.

The corridor looks as it should, the rest of the surface remains unchanged, but this portion of the surface just disappears. If I turn off the cul-de-sac region (but leave it in the corridor), the surface regenerates in the main street region, but if I turn the cul-de-sac back on it disappears again.

Any ideas? Is my corridor just too big that it's going to act up? I considered doing all cul-de-sacs in a separate corridor and pasting the surfaces together, but it seemed this may make connection between the streets and cul-de-sacs potentially problematic.

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u/narpoli — 10 days ago

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u/narpoli — 21 days ago

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u/narpoli — 1 month ago

Corridor Surface - Bad Triangulation at Curbed Median

I tried a new way to model a curbed median (https://www.arkance.us/blog/civil-3d-corridor-median) following that video. This method used offset alignments to define the edge of median, then a separate baseline and assembly (with assembly offset) to define the median as it's own region separate from the full width assembly/region.

The corridor itself looks great, but I absolutely cannot get the corridor surface to model correctly in this area. I've tried defining the corridor surface with every combination of different feature lines, links, and overhang corrections and it is never right. How can I fix this?

Another related/secondary issue is where the curbed median ends, I can't figure out how to accurately model the curbed end of the median. Right now I have that region ending at the station, but then I also get a couple funky links/triangles at the end stations as well.

u/narpoli — 1 month ago
▲ 21 r/civil3d

Unable To Create Intersection - Primary vs. Secondary

I've created 1 corridor that includes all roads and intersections. I was working through creating intersections and all was well until I hit the intersection in red (green ones were successfully created).

I get the error: The primary road for this T-junction will result in a circular dependency with the existing intersections.

Autodesk help (https://www.autodesk.com/support/technical/article/caas/sfdcarticles/sfdcarticles/Error-message-in-Civil-3D-when-trying-to-create-an-intersection-The-primary-road-for-this-T-junction-will-result-in-a-circular-dependency-with-the-existing-intersections.html) indicates an alignment always needs to be a primary or secondary road in intersections. I don't think that is possible without breaking an alignment into two.

Any other possible workarounds?

UPDATE: Found some other forums with the same issue. Seems like there is no solution. I suppose I will manually create that intersection.

UPDATE #2: Recreated the 4-way intersections with the problem street as secondary, then was able to create the terminal 3-way intersection no problem!

u/narpoli — 1 month ago