Vast sums of money are being devoted to developing self-driving cars. To date, licensing requirements require that self-driving cars have a licensed human driver at the wheel able to take over from the machine — thus negating most of the potential value of the technology. Technical progress has been rapid, with cars increasingly able to drive themselves at night and in bad weather
. It is therefore now time for policymakers to identify the criteria under which they would allow self-driving cars without humans at the wheel.