In case you ever get into one of those silly debates about the accuracy of C3D when labeling a pile of dirt to three decimal places, just bring this picture out. The City Traffic department in my neck of the woods laid out this round about this morning using orange traffic cones. When I inquired if a fire truck would be able to turn left through this intersection, the reply was, "We’re still working on that."
Just a friendly reminder, you can model it all you want, but do you know how it’s going to be built? Two guys with a string and some cones.