Does G.M.’s P.U.M.A. Rethink Transportation?

When General Motors unveiled Project P.U.M.A. in New York on Tuesday (with partner Segway), it was showing not so much a vehicle as a vision for a new transportation system. And that’s high risk, high reward, because as much as new concepts are needed, they’re excruciatingly hard to actually put in place. Our highways are haunted with unfulfilled visions, from electric station-cars to statewide hydrogen-refueling networks.

The P.U.M.A. is a two-wheeled, two-seat gyroscopically balanced urban transit device with a top speed of 35 miles an hour and the potential to be remotely operated. Toyota has also shown a fanciful personal mobility option, called the i-Swing, a single-seater pod on wheels, with joystick controls.