thanks guys, nothing serious. my left arm took most of the impact; some skin gone from my thumb (so glad that i wear gloves!) and some bruises. i don't really remember how i fell or got back up. i took a few minutes to snap a photo of the plate and to make sure i didn't need an ambulance, but i (stupidly? stubbornly? sacrificially?) didn't call the cops. later i realised that my handlebars and wheel were out of alignment, but hopefully all can be put back into order. except my seething contempt.