Gas and tire wear implies a ~$2/hour hit, roughly.
Tickets are presumably negligible for long-term drivers? Most people get <1 ticket per year, even with long commutes, and I assume that if you're getting ticketed very often with passengers Uber will drop you as a driver, the cutoff is low for that.
Accidents are hard to call - their 'cost' is basically whatever you pay in insurance (plus some adjustment for future insurance hikes if you file a claim). I don't know how the Uber-insurance thing shook out, so I can't speak to that at all.
The $16/hour wage is now at something like $12/hour (very roughly), but that's neglecting the benefits of having a car (I'm assuming most drivers with Xchange wouldn't have cars if they worked elsewhere, otherwise raise the effective wage by $5/hour).
But of course, that's part-time work. It's voluntarily part-time, but you can't scale up Uber driving arbitrarily - presumably you're already working the highest cash-flow hours and will see decreased hourly wages as you add less-profitable driving time.
So I'll stand by a claim that the money is pretty good, at least in <$10/hour minimum wage markets, but it's locked into a no-benefits, part-time status that prevents it from being an especially good living.