Generally, driverless cars are involved in fewer accidents than their human-driven counterparts. But during low-light conditions – specifically at dusk or dawn – robot cars were found to be five times more likely to end up in an accident.

The researchers conclude that self-driving cars are slightly less likely to crash into something than a human driver. The difference is minor—the rates only differ by a few percent. When self-driving cars and human-operated cars collide, it's usually the human driver's fault. Credit: Nature Communications