This applet shows what traffic at a 4-way 6 lane intersection will look like when we all have perfectly smart cars. In a word: insanity! You won't want to watch outside the window while it's on autopilot... check it out: http://www.cs.utexas.edu/users/kdresner/2004aamas/sixbysixres.html Once page loads, click on 'Simulator' (in left hand column) and then 'Run'. "Java applet simulates a perfect meshing of a 6-lane bi-directional 4 way traffic intersection where the delay per car is about .076 seconds, compared to ten seconds on average for a perfectly optimal stop light. Demonstrates what could be done with AI-controlled traffic flow."