"Biking is OK since it maintains social distancing," Andy Lynch, a spokesperson for San Francisco Mayor London Breed's office, said. "You can do it for exercise or essential needs. But it's the same policy for other outdoor activities. Yes, people should exercise for mental and physical health, but they should maintain social distance of at least six feet from others and not do it in a group. You should wash your hands after the activity."
https://www.sfgate.com/bayarea/article/Can-you-ride-your-bike-shelter-in-place-order-15137490.phpWell, there's some good news!
Happy riding,
Andrew