> But even then, I'd be surprised if the driver who's reckless/inattentive enough not to pay attention to the person in front of them at a stop sign both notice

> But even then, I'd be surprised if the driver who's reckless/inattentive enough not to pay attention to the person in front of them at a stop sign both noticed and understood what the signal meant. I have used it in several circumstances where I am fairly certain the driver was responding to the signal. Whether the understood the signal or not is an open question. If they didn't, it seemed to be enough to get them to slow down -- which is all that I can really ask for. As for the whole signalling while braking situation on bikes, it's kinda nuts. I have to make a left turn while going down hill at one point of my commute. It's pretty much signal, brake with both hands, signal and turn. I understand why bikes don't apply both brakes with one lever, but it is awkward at times.