If you watch the videos more carefully, you will notice the people who speed by at 85 MPH later enter the screen again, because that is the nature of freeway traffic.
I predict that a few hundred of these on the road will measurably improve safety and decrease severe congestion by being that one sane driver that defuses stop-and-go catastrophes. In fact I think CHP should just contract with them to pace 101 in waves.
"Waves" are really what we would want them to prevent: https://en.wikipedia.org/wiki/Traffic_wave
The autonomous cars can prevent these waves from forming, which would get people to their destinations faster than speeding.