Not sure I believe the title is justified given what the rest of the article says. I'm no statistician, but I'm not sure if there are enough miles being driven

Not sure I believe the title is justified given what the rest of the article says. I'm no statistician, but I'm not sure if there are enough miles being driven that good conclusions can be drawn about whether self-driving cars are getting better or not. Lots of testing is taking place outside of California due to other states' efforts (like changing regulations) to cater to it. So data from just California very likely doesn't tell the whole story. Also, as has been mentioned here before, once they've solved and tested the easy cases, they might move on to solving and testing the harder ones. So there isn't an apples-to-apples comparison on test failure rates from one year to another because they could be testing different things.