I agree, this is bad news for privacy. Nevertheless, I think the courts got it right.
If instead of being mounted on a pole there had been a person holding the camera, there would be no question about the legality or morality of the evidence collection. Houston shouldn’t have had a gun and so I have very little sympathy for the guy.
I think about it this way: taxi and truck drivers are about to lose their jobs to robot cars. Think of a camera-on-a-pole as the first wave of robot deputies. Welcome to the future, you better follow the rules.