I remember learning a few years ago that it was a New Yorker piece. Kind of surprising given how much it sounds like a copypasta/greentext post.

I don't remember if ever wanted more lanes, but when I started driving (grew up in the south so that's all I knew) I could tell that something seemed inefficient. My phase that I'm embarrassed by now was when I thought traffic would be solved by replacing human drivers with self-driving cars. Very-young-me already knew the answer though lol (I played with a train set growing up a lot).