Here is a Java applet that simulates a perfect meshing of a 6-lane bi-directional 4 way traffic intersection. More information here.
TransCAD for the Web
While doing some internet searches, I bumped across Caliper Corps website, the makers of TransCAD for Web. It has some serious .NET stuff, I wonder what kind of people work on creating this software…serious Traffic Engineers with software development background, or the other way around.