The self-driving car crashes that usually make the news are, unsurprisingly, either big and smashy or new and curious. The Apple that got bumped while merging into traffic. The Waymo van that got t-boned. And of course, the Uber that hit and killed a woman crossing the street in Tempe, Arizona in March. Look at every robo-car crash report filed in California, though, and you get a more mundane picture--but one that reveals a striking pattern.