Are Prefabricated Overpasses the Answer?

Lacey thinks that the unprecedented expansion of Indian and Chinese cities requires out-of-the-box thinking, like Elon Musk's proposals to build electric, supersonic planes and pre-fabricated freeway overpasses.

Lacey: "I have to admit, at the time, I was more excited about the planes. But his freeway idea may be a better business. It would dramatically affect the lives of billions (literally) and create at least millions of revenues in the developing world where quick, cheap options are needed and there is hot-and-heavy government money to pay for it."