Currently reading: Elon Musk showcases high-speed EV transport tunnel
Tesla boss says Boring Company's Loop system can transport modified autonomous EVs at speeds of up to 150mph

Tesla boss Elon Musk’s Boring Company has unveiled a prototype underground tunnel that it says can transport autonomous electric cars at speeds of up to 150mph.

The one-mile test tunnel in Los Angeles has been constructed to show the feasibility of The Loop, which Musk said was the “future of mass transit”. 

Electric cars are modified with special tracking wheel attachments, which allow the car to be attached to a track in the tunnel. The attachment is designed to keep the car stable while travelling at high speeds, guided by its own autonomous functions. It is not clear what 'level' of autonomy such cars will need to have to use the tunnel.

The Boring Company has modified a number of Tesla Model X SUVs to test on the prototype tunnel. Musk says the system is currently capable of reaching speeds up to 110mph, but test runs during the launch event were limited to 50mph.

While only cars from Musk’s Tesla firm has so far been used on the tunnel, the entrepreneur said that any electric car with full autonomous capability would be able to use the system.

Musk said that each tunnel could eventually support up to 4000 cars per hour, with a number of extra cars circulating the system capable of picking up and dropping off pedestrians. 

A number of reports from those who had test runs said the ride was bumpy, which Musk said was down to the short timescale to prepare the tunnel. He claimed the finished version would be “as smooth as glass.”

He added that the smaller size of the tunnels – less than 14 feet in diameter – compared to those for underground train lines (around 28 feet) meant they were cheaper and quicker to produce. Musk added that he was also investing in developing boring machinery to improve speeds.

While some transport planners have questioned the viability of the scheme, suggesting it would create bottlenecks at the entrance and exit points, Musk said the small size of such stations meant more could be installed than for a subway system. He added that, while pricing was not set, he was aiming to charge $1 (80p) per trip.

The Loop is a separate project to the Hyperloop One scheme that Musk is also involved in. That concept uses a vacuum-sealed turbo to propel large autonomous pods at speeds above 600mph, the new project is designed to work with modified cars.

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James Attwood

James Attwood, digital editor
Title: Acting magazine editor

James is Autocar's acting magazine editor. Having served in that role since June 2023, he is in charge of the day-to-day running of the world's oldest car magazine, and regularly interviews some of the biggest names in the industry to secure news and features, such as his world exclusive look into production of Volkswagen currywurst. Really.

Before first joining Autocar in 2017, James spent more than a decade in motorsport journalist, working on Autosport,, F1 Racing and Motorsport News, covering everything from club rallying to top-level international events. He also spent 18 months running Move Electric, Haymarket's e-mobility title, where he developed knowledge of the e-bike and e-scooter markets. 

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MandyOrwell120 9 January 2019

Thank you for this article. I

Thank you for this article. I like reading about Elon Musk and his achievements. He's inspiring me to study and to be engineer. I was reading this article just now and I think I'm going to get a degree in engineering there.

CarNut170 23 December 2018

Interesting, but...

It's an interesting implementation, and in a city like LA is certainly a welcome way to circumvent traffic.

Ultimately however, slightly alarming - hopefully city officials have a well put together plan to avoid a spiders web of underground tunnels, and the unintended consequences these could cause!!

With a thought through transit network this could certainly take some of the pressure off LA's busy roads though - if only as a stop gap, and ultimately a bit of a gimmick

Ubberfrancis44 19 December 2018

Genuine question.... Whats

Genuine question.... Whats the point?! If the cars can drive themselves then why the hell do we need tunnels to do it?! Is this like a very fast subway for cars?