Abstract

Every year, 1.35 million people are killed on roads worldwide and even more people are injured. Emerging self-driving car technology promises to cut this statistic down to a fraction of the current rate. On the face of it, this consideration alone constitutes a strong reason to legally require — once self-driving car technology is widely available and affordable — that all vehicles on public roads be self-driving. Here I critically investigate the question of whether self-driving, or autonomous, vehicles should be legally mandated. I develop an argument — premised upon Mill’s Harm Principle — that any legislation mandating the use of self-driving vehicles on public roads is morally impermissible. The Harm Principle, under its most plausible interpretation, has it that the state is warranted in legislating against some activity only if that activity violates the rights of others. In brief, I argue that a human driver, who opts to drive herself on public roads rather than rely on self-driving technology, does not violate anyone’s rights when she so acts. Consequently, when granting the Harm Principle, it follows that the state is not warranted in mandating the use of self-driving vehicles on public roads. If I am correct, the proponent of a self-driving vehicle mandate must reject the Harm Principle. Given its intuitive plausibility and central place in liberal philosophical thought, this is a weighty cost.