Elon Musk’s Boring Company, with a massive tunnel-based transportation system to get people’s cars around faster, is now selling itself as the future of mass urban transit.

In a series of tweets last week, Musk explained that the focus of the company’s Los Angeles and East Coast projects—massive and complicated concepts for a network of intercity Hyperloop tubes and separate intracity transport systems that zip around high-speed electromagnetic sleds — is shifting gear to make their priorities moving people, instead of private vehicles.