Waymo shows off how it obeys a cop redirecting traffic.
For years, the most common slide in a skeptical talk on robocars would show a cop directing traffic, and ask how the cars will ever handle that.
Here's a video from Waymo showing off that ability.
Update: There is a report the car, while it did detect the hand signal, also waited for confirmation from the remote operations center. I am also waiting for confirmation -- on this tidbit.