- It's fine to cycle alone
- Don't take risks: don't tackle something at the edge of your limits on your road or mountain bike.
Any kind of incident that puts you in the ER right now is bad for two reasons: you consume supplies that will very soon be needed for C-19 patients and you run the risk of becoming infected because that's where all the sickest people will be. (Thanks Colin)
Read: https://www.cyclinguk.org/article/coronavirus-qa-it-safe-cycle