I am using the roundabout design tool as the first step in developing the 2D design of a roundabout. I am having some trouble getting the defection path radii I need in order for the roundabout design to progress to the next step, however this can only be achieved if I can alter the alignment of the approach legs.
The default setting for the roundabout tool/wizard is for all alignment legs to intersect at the centre point of the roundabout - something which does not readily allow the deflection radii to be met even remotely (in this case and others)
Whenever I try and realign the alignment/approach leg and run the design wizard again (in the hope the other kerb alignments will realign to match), it jumps back to the initial alignment pointing to the centre point. Refer attached screen shots.
Of course designing the roundabout in the traditional way is always the sensible alternative to achieve the correct layout & deflection, however if this function exists it would be handy to speed up the initial design process.
Any assistance please
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Jim, you have found the reason that I have never used this tool.
Roundabout design in the UK particularly is an art and I have never designed without having the main alignments offset from the centre as this assists in obtaining adequate deflections.
I advise that you just either create manually or you create the main design using the tool then export & import landxml then modify to suit. Realistically I have found that to just manually design is faster.
Thanks Mike. Yes the roundabout design is an art form and we are pulling our hair out designing from scratch - but thats what its all about.
Although I think it has a long way to go, I will put this on the wish list for future C3D releases to assist in the process.
Horizontally the design process may be easier in the future.
Savoy (now part of AutoDesk) have a package for roundabout design which does horizontals based on UK standards (and possibly other varients) and interfaces with Arcady. Gets the information for the flare length, entry & exit widths directly on the fly.
I have used this version a couple of year ago and it worked very well.
Does not as far as I am aware do corridors yet.