I've drove mine without any mirrors for the last three summers and I've been pulled over twice for speeding and never had a cop say anything about not having mirrors yet. but maybe I've just been lucky haha
Just been lucky :p (or maybe they just don't care)
I looked into it after my side mirror was knocked off my old car while parallel parked, and you're required by law to have at least 2 mirrors on the vehicle. I was still okay, having the rear view + the other side mirror. (I think) you'd also be good with just two side mirrors.