Freeform/Irregular Junction Design

[juliaanderson]

Hi I'm looking for some advice on if it's possible to use Civil3D to design the junction shown in the screen grab below? This is a 6.5m access road with a tie in to an existing public road. The junction sizing is designed purely for the purpose of large vehicle access so the radii are dictated by swept paths. Can anyone shed any light on how to approach this before I resort back to using PDS with which I could have had this junction designed in minutes instead of spending hours scrolling how-to guides! 

[cwr-pae]

Thats just an intersection and you model it like any other. Do an edge of road alignment and profile, add them as an added baseline to the corridor and build in towards the center targeting the centerline and center profile. Or you could build the central roadway in one corridor and the turnouts in another (or two) and paste the surfaces together for finished grade. I'm not sure if the intersection wizard can handle that kind of intersection or how well the connected alignments will be able to handle this, you may have to manually keep things aligned as changes are made. 

[juliaanderson]

Just for info, the easiest way I found to model this junction was to actually use connected alignments.

[m_kingdon]

I agree with @cwr-pae comments.  Individual alignments drawn over the polylines shown in the diagram.  You could use connected alignments as well to tie them into the main road LHS alignment.

The one thing I'd add to make sure your the point where your centre line alignments join is perpendicular.