Brocephus

You're obviously being sarcastic here, but you still kinda lost me. When we're cycling on the road, the on-coming traffic, that's at least a full lane away from us, isn't the threat that the traffic behind us is. The traffic we're riding with, that is of most risk to us, is coming up from behind us, and is moving very quickly and is basically unseen, and that's what I was referring to. (and even the relatively few riders that use those tiny helmet mirrors, generally aren't going to have enough warning time to veer off into the ditch, to avoid a vehicle that swerves into their rear wheel).