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This installment describes a fundamental capability for future intelligent vehicles: cooperation. The possibility of cooperating and benefiting from one another's knowledge, and information in general, is crucial to achieving not only coordination as described in the example at this article's end but also high road efficiency and, consequently, global optimization. Intervehicle communication, and thus coordination, is also the key to improved safety, as Sadayuki Tsugawa described in this department in July-August 2000. If you have any comment on this department, feel free to contact me. I also seek contributions on the current status of ITS projects worldwide as well as ideas on and trends in future transportation systems. Contact me at broggi@ce.unipr.it; www.ce.unipr.it/broggi.