What you’re looking at is a salt circle, a traditional form of protection—from within or without—in magical practice. In this case it’s being used to arrest an autonomous vehicle—a self-driving car, which relies on machine vision and processing to guide it. By quickly deploying the expected form of road markings—in this case, a No Entry glyph—we can confuse the car’s vision system into believing it’s surrounded by no entry points, and entrap it.
So you fight. You kill. Watch friends die. Its usually quick, almost never quiet, but for the rest of your life, when you remember sitting at the bar with them, they’re blown open. You picture the nights you spent downtown at Scruffy Murphy’s, but instead of the stupid hookah shell necklace, your boy’s jaw is blown off, and his left eye is ruined, and he’s screaming.