Data shows the measurement of how many miles the typical individual cell phone traveled by each county.
On March 9 in Chester County, the typical cell phone traveled 5.8 miles. A week later on March 16, that was cut in half to 2.8 miles. And down to 0 by March 23, days after the Pennsylvania shutdown order.
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And in a rural area like Salem County, New Jersey, it was 8.4 miles on March 9. A week later, 6.7 miles and down to 1 mile by March 23.
You can see your county's data below: