Terrifying and exhilarating, it seems built for a dystopian future somewhere between Tron and Blade Runner, with the hands from Edward Scissorhands thrown in. Cars aren’t comfy cocoons, they’re knives on wheels. And while GM isn’t a company most associated with innovation or autonomous vehicles, it’s been exploring the technology since at least 2007, when it started working with Carnegie Mellon and competed in a DARPA self-driving car challenge.