"they just needed people to believe wholeheartedly they were using one." Don't they mean "seeing one" instead of "using one"? Or am I missing something? "fill in gaps where we currently communicate via subtle gestures, eye contact and other less obvious mechanisms." This also struck me as odd - do pedestrians and other drivers really make "eye contact" with drivers to gauge their intention? I guess it's possible, but…
This statement both terrifies and piques my interest simultaneously ...