Cars without drivers still need a moral compass. But what kind?

Loved by some philosophers, loathed by others, the so-called trolley problem is the quintessential moral puzzle. A runaway train is heading towards five people tied to a track. You can change a signal, diverting the train down a spur, so saving five lives.

https://www.theguardian.com/commentisfree/2018/nov/14/cars-drivers-ethical-dilemmas-machines