Well, as it says on the title. How can I create a good roundabout? Everytime I try, it becomes wonky and just in general rubbish. Is there an art to doing this, say moving the barrier by 2' each barrier? Anyhelp is appreciated.

You could use the distance tool. Start it in the middle of the roundabout and make sure everything you place is a constant distance from the centre with the distance tool.

What I do is place a marshal or route point and work around that,