Transit systems across the United States continue to run service for essential workers, transit dependent riders, and those avoiding car traffic.
For BART, as example, ridership during SIP has been largely those lacking a car, people of color and making >$50K/year.
Public transit agencies across US - from both Democratic and Republican-controlled states - face similar challenges.
We've been logging all COVID-19 related updates since way back in February at bart.gov/covid19. It's very long now, but well worth a check.