I watched that video the other day, pretty sure it didn’t say that. What it did point out though is that in most of the system, other than the one main line, there’s just one single-lane tunnel so that when a car is in a tunnel going one way, cars going the other direction have to wait to enter the tunnel until the tunnel is clear.

The title of the video seems pretty accurate: “The Vegas Loop Is Getting Progressively More Stupid.”