The Purposeful Play on Words

The air pressure sensors would control the brakes on each car. Elon points out that you'd just be better off completing the route and then having EMS waiting for you when you got off. If one of them started to stop or something, if the system started to break down, all the cars would be directed to put on their brakes. And like I mentioned earlier, when Elon Musk gets aggravated, things start happening.