The cause was easy enough to identify: Data parsed by Kuhls and her colleagues showed that drivers were speeding more, on highways and on surface streets, and plowing through intersections with an alarming frequency. Conversely, seatbelt use was down, resulting in thousands of injuries to unrestrained drivers and passengers. After a decade of steady decline, intoxicated-driving arrests had rebounded to near historic highs.
… The relationship between car size and injury rates is still being studied, but early research on the American appetite for horizon-blotting machinery points in precisely the direction you’d expect: The bigger the vehicle, the less visibility it affords, and the more destruction it can wreak.
I looked into similar data from the NHTSA regarding accidents during lock down on the hypothesis the insurance companies would have an interest in WFH. I was stunned to see accidents did not decrease. Anecdotally i was working in field service during this period, and observed what seemed like less traffic, and yet the data disagreed with my impressions during the time.