People can hear you even when you have a full face helmet on - its your ears that are muffled by the padding. I got cut off by a lady once and pulled up into the turn lane next to her at the light. I muttered to myself, "Stupid 8itch" and the next thing I know she's rolling down the window and begins to defend to me why she isn't a 8itch... unfortunately the light changed and I had to go ahead and turn before I could tell her how wrong she was... 