the thing, is there is hundreds of these types of problems that have to be solvedrone at a time in order for it to work all of the time. >> rose: issues of people, either a driver attacked fro by somebody from the back or a driver acting hysterical in terms of taking off, not stopping, running stop signs, going too fast, how big an issue is that for you? what are you going to do about it? >> well, look, you know, we -- you know, uber's number one cultural value is to celebrate the city and what that means is everything we do is to make a city better and, so, sort of the first thing we do is say what can we do -- when we first got going, what can we do to make for the safest way to get from point a to b, that's part one. part two is, well, that's great, but how can we actually help to make the city safer? no city's perfect. no system will be perfect, but can you institute technology, can you roll out technological systems that make uber the safest place in a city? so this is things like, well, of course, things you do before the trip even happens -- making sure the right drivers get on th