Imagine you are in charge of the switch on a trolley track.
The express is due any minute; but as you glance down the line you see a school bus, filled with children, stalled at the level crossing. No problem; that’s why you have this switch. But on the alternate track there’s more trouble: Your child, who has come to work with you, has fallen down on the rails and can’t get up. That switch can save your child or a bus-full of others, but not both. What do you do?
This ethical puzzler is commonly known as the Trolley Problem. It’s a standard topic in philosophy and ethics classes, because your answer says a lot about how you view the world. But in a very 21st century take, several writers (here and here, for example) have adapted the scenario to a modern obsession: autonomous vehicles. Google’s self-driving cars have already driven 1.7 million miles on American roads, and have never been the cause of an accident during that time, the company says. Volvo says it will have a self-driving model on Swedish highways by 2017. Elon Musk says the technology is so close that he can have current-model Teslas ready to take the wheel on “major roads” by this summer.
Who watches the watchers?
The technology may have arrived, but are we ready?