My neighbor's legally parked car was just rear ended and pushed about 50 feet forward. I can only assume the woman who hit it was paying more attention to her cell phone than she was to her driving. I've had 2 internet bicycling acquaintances who have been killed by similar un-attentive drivers.
My worst bicycling injuries have all happened on car-free trails. I understand that frequency vs. severity issue. But I'm thinking a lick that's hard enough to push a parked Buick 50 feet would definitely seriously injure or even kill a cyclist and there's really no defense or precaution for that.