From the article:

The thing about the 12-foot-wide tunnels is that they can’t accommodate two lanes of traffic. So we paused for over a minute, waiting for the car coming in the opposite direction to clear the tunnel. The driver, who was, to be fair, absolutely lovely, cheerfully explained to me that the tunnels are wider than they appear. This did the opposite of reassure me. I’ve seen the claustrophobic videos of Teslas lined up in the tunnel during busy conventions. “Wider than they appear” seemed extremely relative.