Volkswagen asked the internet what products they could improve on besides cars and were told to explore strollers that automatically brake. So, they got to work and decided to go a step further by making a self-driving stroller.
After a few false starts with a fake baby in the lab...
They got a working prototype that could not only brake, but also used an "adaptive cruise control sensor" to keep an exact distance from another "vehicle," or in this case, a human.
That way, the stroller can keep up at a safe distance, and also brake when need be.