Intersection Design

http://xkcd.com/c277.html

If you are looking for some information about how to model and intersection in Civil 3D, check out this link:

http://www.civil3d.com/2006/11/another-intersection-sample-drawing/

and this one, too.

http://www.civil3d.com/2006/10/sample-drawing-for-intersections-and-culdesacs/