Griffith University's Intelligent Control Systems Laboratory collaborating with INRIA'S IMARA laboratory, completed what we believe is the first on-road demonstration of autonomous passenger vehicles performing cooperative passing and traversal of unsignalized intersections. (Unsignalized intersections have no traffic lights, stop signs, or yield signs to control traffic flow.) This demonstration mated ICSL's communication and collaborative decision-making subsystems with IMARA'S experimental vehicle platforms, creating autonomous vehicles capable of real-time cooperation in real-world applications. The article describes the experiment.