Uber’s off the hook for its self-driving car’s fatal accident — but what about human drivers?

Uber‘s been let off the hook by prosecutors in a case involving one of the company’s autonomous test cars that fatally struck a pedestrian in Tempe, Arizona last year, reports Reuters. However, the back-up driver behind the wheel will likely be referred to local police for further investigation, and that could potentially see him face charges of vehicular manslaughter for the accidental killing of Elaine Herzberg.

The news should serve to advance our thinking on one of the biggest questions we’ve had for years about self-driving vehicles: who is at fault when a self-driving car gets in an accident? We might be a bit closer to the answer than a few years ago, but we don’t yet have the entire rulebook to decide who to blame in such instances.