https://www.theguardian.com/technology/2018/may/09/elon-musk-the-boring-company-tunnels-dont-fit-tesla

Musk launched the Boring Company to tackle LA’s hellish traffic – but to make the digging affordable, the tunnels will have to get smaller

In December 2016, Elon Musk was stuck in Los Angeles’s infamous traffic again, likely in his personal Tesla Model S. “Traffic is driving me nuts,” he tweeted. “Am going to build a tunnel boring machine and just start digging.”