Here’s how it happened for me. I was sitting in the back seat on the passenger side. I had just asked the driver how long he’d been with Uber, and he said, like he’d answered the question a thousand times, “Six months.” Then I asked how many rides he’d given, and there was a sort of cool pride in his face and I was expecting a big number, when I saw—or really felt—a presence to my right, a buzzing, looming mass. I looked out the window, and there was the wheel of an eighteen-wheeler right beside my door, coming closer. I still don’t know whether it was changing into our lane or we had drifted into its.