This is a very important point. I made this point above. Someone already mentioned the car was speeding 3 mph above the speed limit and defending it because...you do it?
If our we allow autonomous cars to be as reckless and dangerous as human drivers (which is already dangerous enough to make it one of the top killers in this country) then what is the point of AV's anyway?
Driving no faster than the speed limit under any circumstances causes safety issues. You get a continuous stream of cars cutting in front, some of them irate about having to accommodate the SDV's law-abiding nature. I'm relatively sure you can replicate this effect easily in most American metropolitan regions.
Long term benefit of self driving car is that I don't have to worry about the tedium of driving. I doubt uber (and most people) gives a shit about improving driving standards.