https://www.cnet.com/roadshow/news/self-driving-cars-trolley-problem-mit-study/

"People who think about machine ethics make it sound like you can come up with a perfect set of rules for robots, and what we show here with data is that there are no universal rules," said MIT computer scientist and study co-author Iyad Rahwan.

The study, whose results were published today in the journal Nature, involved an online questionnaire called The Moral Machine in which respondents from around the world were asked to pick between two outcomes in various situations -- similar to the famous "trolley problem" ethical thought experiment. For instance, should a self-driving car hit a group of children or elderly people, or should it crash into a homeless person or a corporate executive?