It is a classic problem and a test of where our morality lies: if a runaway trolley is uncontrollably heading down a set of tracks and you have the ability to use a lever and choose between either five people or one, what would you do?

A spin-off of the classic trolley problem has been used by researchers from the Massachusetts Institute of Technology (MIT) Media Lab in an experiment called the Moral Machine, which has been designed to test how we view these moral problems in light of the emergence of self-driving cars.