Every self-driving car company has missed its targets. It turns out that the problem is much harder, from a purely technical perspective, than the teams building the technologies were willing to acknowledge. When you jump into the car for a quick trip to the grocery store, you make roughly 160 decisions for every mile you travel. While that might not sound like a lot, when the decisions are based on a near-limitless number of variables, the scale of the challenge comes into sharper focus.
