Others have said this, but it bears repeating: this accident was not your fault, and if it happens again, it still won't be your fault (unless, of course, you're at fault. ) It's natural to shy away from activities that have resulted in major injury, but if you go back to cycling, you won't be more vulnerable than before. If anything, the likelihood of you being in another accident will be even less since most people are super alert after going through such a recovery.