Usually traffic deaths decrease when people drive less. This has not been the case in Illinois or the United States as a whole in the last year:

About 1,166 people died in motor vehicle crashes in Illinois in 2020, a nearly 16% increase over 2019, according to the Illinois Department of Transportation. That’s a provisional number, said IDOT spokesperson Guy Tridgell, since it takes the state agency 12-18 months to finalize annual data…

Speeding and traffic fatalities typically go down during recessions, according to an October study published by the National Highway Traffic Safety Administration. In Illinois, for example, deaths dipped sharply in 2008 and 2009 according to state data, though they’ve been up slightly since…

About 28,190 people died in crashes from January to September 2020, more than a thousand more fatalities than in the same period in 2019, the federal agency estimated. A full annual report is expected to be released in the late fall…

What’s more, traffic deaths nationally were down from March to May, but jumped back up after states began reopening in June, according to the agency’s estimates.

This suggests safety is not solely a function of the number of miles driven or trips taken. How people drive and the conditions matter quite a bit. In this case, the article hints at multiple possible reasons for this jump. This includes speeding, more impaired drivers, and less seat belt use among those hurt.

I wonder if there are several other factors at play. With many public and private locations shut down, did driving become an even more important escape for some Americans? With limited places to go, driving and doing so dangerously could be a kind of release not available elsewhere.

Second, is there a safety feature to a certain level of traffic? With fewer people out, does this encourage riskier driving compared to having to navigate more vehicles on the road? Too many cars likely leads to more accidents but what about too few compared to typical conditions?