“The concept of car elevators on skates add a bunch of engineering challenges, such as reliability and safety of the elevator, loading and unloading times, and the number of dedicated areas in a city you’d need to do this at scale,” said Constantine Samaras, assistant professor of civil and environmental engineering at Carnegie Mellon University.

He’s not sure the skates will work but sees potential benefits from Musk’s new venture. “The best-case outcome from The Boring Co. is innovation and dramatic cost reduction in using existing tunnel boring machines to construct tunnels for high-volume rapid transit systems.”
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