Many Floridians appear to have reached a similar conclusion. Analysis of cellphone location data by companies like Descartes Labs Inc. and SafeGraph Inc. shows that residents’ daily mobility began dropping sharply after March 15, as it did in other parts of the U.S. By the following week, it had declined more than 50% statewide from an established baseline, according to a compilation of such data by a lab at the University of Wisconsin-Madison. In Miami-Dade and Broward counties, it had decreased more than 80%.
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