https://www.mercurynews.com/2020/03/24/bay-area-sees-nations-biggest-traffic-drop-in-race-to-contain-coronavirus/

The Bay Area’s shelter in place order to contain the spread of COVID-19 has slashed car traffic more dramatically than any other major urban area in the country, new research shows.

The disappearance of the Bay Area’s fearsome congestion has been cutting smog and could also be helping keep supply chains strong: Trucks and the goods they haul are moving much faster than normal through our typically traffic-choked region.