What is good driving? It's a deceptively simple question that has challenged researchers, policymakers, and automotive safety experts for over a century. Decades of technical literature, academic research, and industry standards have resulted in the development of a wide variety of topics, values, principles, and models, yet no overarching framing or clear path to operationalization have been established. As autonomous vehicles join our roadways, this question takes on renewed importance and complexity. It’s a question we take seriously at Waymo, given our mission to improve road safety. (....)