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. Unfortunately, one person is on the spur, and would die. What should you do? Most people – young and old, rich and poor – believe you should divert the train.

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