Alana Samuels:

Cities such as New York and San Francisco have extensive public-transportation systems that carry millions of residents by bus, train, boat, and light rail. But in recent years, there’s been an expanding fleet of private vehicles too: Lyft, Uber, Juno, Uber Pool, and the Google Bus, to name a few. These offerings give commuters more choices, but may also undermine the public services available. They raise fundamental questions about the future of how people will get around cities.

I used to think these services were just for the rich—a friend of mine who lived in New York insisted on taking an Uber Pool to work every day because he said it was a much better experience than public transit. But as the options increase, they carry an expanding array of people. This morning, for instance, I walked one block from my house to take a private van service called Chariot to my office in San Francisco. Before Chariot, this commute took at least 40 minutes and consisted of riding a bus to the subway to another bus. Chariot—a shared van service run by a private company—brought me directly from my house to my office in just over 20 minutes. And it cost roughly the same price as the lengthier public transit option.