Millions of fuel cell cars, powered by high-tech trees are one vision of India's mass-transit future.
A second mass-transit flying wing design has surfaced, and this one comes with a snazzy video.
Imagine a future where the TSA is out of a job and hopping on an airplane is as easy as catching a train.
The range of an electric vehicle has always been its most limiting factor. But soon, topping up a charge may be faster than filling a gas tank.
The German AutoTram is trying to reap all the benefits of train, tram and bus networks, without taking on any of the negatives. The end result is something that's almost ludicrous on paper, but also a clever new option for mass transit.