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Joining roundabout corridors to main alignments

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Message 1 of 6
TOONFANCC
1244 Views, 5 Replies

Joining roundabout corridors to main alignments

I have created a roundabout and built corridors using the approach edge alignments. How do i tie these in to the corridors of my main alignments? I have attached images of the roundabout I have built so far and the approach and exit assemblies I have been using.

 

Any help/advice on building roundabouts would be gratefully received.

5 REPLIES 5
Message 2 of 6
doni49
in reply to: TOONFANCC

Did you use the "Create Roundabout" tool?  Or did you create a corridor for the roundabout?

 

Roundabout.png



Don Ireland
Engineering Design Technician




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Message 3 of 6
TOONFANCC
in reply to: doni49

I used the Create Roundabout wizard, and then created corridors using the approach edge and inner edge alignments it created.
Message 4 of 6

You are going to need a bunch more assemblies to model it, use the large pieces you have currently and then build the other assemblies to model the holes. 

Message 5 of 6
dsimenic
in reply to: TOONFANCC

I make corridor with multiple baselines and regions. Typically, one baseline is the ronudabout istself (radius - i prefer inner, small radii); others are edges of approaches.

Message 6 of 6
MikeEvansUK
in reply to: TOONFANCC

Work from the outside in with roundabouts.

 

You will need alignments as follows. Depends on your design standards of course these are for Brits but is stil a good method.

 

Roundabout crown line at 1/3 2/3rds.

 

Edge alignments following the entrances & exits created from entry to exit lanes for each junction.

 

centrelines for all junctions

 

See other post for more detailed description on modelling.

 

http://forums.autodesk.com/t5/AutoCAD-Civil-3D-General/Complex-Roundabout-Help/m-p/3752375/highlight...

 

Stockdale method; http://www.docstoc.com/docs/120766470/Roundabout-Design---Part-1.

 

 

Mike

 

Mike Evans

Civil3D 2022 English
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