Why Misleading Mobility Measures Are Making Things Worse


A close examination shows that the UMR has a number of major flaws that misstate and exaggerate the effects of congestion, particularly the Travel Time Index (TTI).  TTI is the ratio of average peak hour travel times to average free flow travel times. Furthermore, for the 51 metropolitan areas analyzed in Driven Apart, the UMR overstates the cost of congestion by about $49 billion. Because this methodology does not take into account travel distances, it universally rewards cities that are spread out as opposed to compact urban areas.

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