Billionaire entrepreneur Elon Musk has promised members of the public will pay just $1 (£0.74) for 150mph trips through his tunnels beneath Los Angeles.
The Tesla founder's firm the Boring Company plans to create a network of passageways underneath the city to help people dodge its notoriously busy traffic.
Musk shared more details about the project, which will carry passengers at high speeds aboard electric shuttles, at a Boring Company event on Thursday evening.
Describing the service - dubbed Loop - as 'almost like an autonomous, underground multi-level car system', Musk said the tunnels may one day number in the thousands.
'It's one [solution for LA traffic] we think could work and is worth trying,' he said.
The SpaceX founder added he would offer free trips through the first two research tunnels to get public feedback before proceeding with a larger system.