Corridoring a roundabout can be a little confusing and tricky. I just recently designed and corridored two roundabouts in a subdivision I was working on. To save time, I corridored the roundabout with a few profiles and feature lines. You can use the intersection feature but you could be looking at very complex corridor and subassemblies. In part 2 of my post on roundabout, I will show you a few shortcuts on corridoring a roundabout. Please feel free to make comments or email me if you have question.