Map from the New York Times. Data from the week of March 23. States and cities with known stay-at-home orders are crosshatched and outlined in black.
Also interesting is that data like this can be derived from cellphone data of 15 million people.
The location data, from Cuebiq, a data intelligence firm, measures the range that people travel each day. It cannot predict where outbreaks will spread, and it does not track how many interactions people had while they were traveling. Not all travel is problematic: A person driving for a few miles to pick up groceries would not be violating stay-at-home orders. And people in cities can infect others without traveling far.