Sometimes good judgment can compel us to act illegally. Should a self-driving vehicle get to make that same decision? If a small tree branch pokes out onto a highway and there’s no incoming traffic, we’d simply drift a little into the opposite lane and drive around it. But an automated car might come to a full stop, as it dutifully observes traffic laws that prohibit crossing a double-yellow line. This unexpected move would avoid bumping the object in front, but then cause a crash with the human drivers behind it.Should we trust robotic cars to share our road, just because they are programmed to obey the law and avoid crashes?