Self-driving cars have flooded San Francisco's streets, and not everyone is happy. Street activists have been using a low-tech solution to incapacitate the vehicles.
You also can render a human driven car immobile but standing in front of it and have a buddy come up from behind. And what does that prove other than you're asshole? I don't see how this activism is different.
Yes it is. Google “traffic cones stop autonomous cars” and look at the 30 “articles” that pop up including npr recycling the same story multiple times.