A series of vehicular traffic experiments conducted in Omaha, Nebraska, shows that the two-fluid model of urban traffic is valid not only at the network scale but also at the arterial street scale. The data collected support the validity of the two assumptions of the two-fluid model for traffic on arterial streets. The two-fluid parameters are effective in assessing the quality of traffic between different arterial streets, over time on the same arterial street, and on portions of an arterial street. The scalability of the two-fluid model also permits systemwide effects of localized changes to a traffic network to be assessed.
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