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Urban Mobility Study
An annual statistical report on the extent and performance of the roadway systems in several dozen U.S. cities, presenting about two decades'-worth of data. Measures include the amount of time an average driver spends stuck in traffic, the difference in travel time between trips made during peak vs. off-peak hours, and the economic cost of congestion due to lost productivity and wasted fuel. From the Texas Transportation Institute at Texas A&M University.
http://mobility.tamu.edu/ums/

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