It overtakes a few cars on the inside in that video. Is that allowed?
However, Colorado has a "left lane law" that applies on two+ lane highways with speed limits above 65mph. It is illegal to impede traffic in the passing lane, even if you're going the speed limit. https://codes.findlaw.com/co/title-42-vehicles-and-traffic/c...
A different law requires drivers in the passing lane driving below normal and reasonable speed, to change lanes (move to the right or pull off the road). If you're driving at the speed limit, it's by definition not less than normal or reasonable. And prior to the "left lane law" state patrol couldn't do anything about impeded left lane traffic so long as the impeding vehicle was moving at the speed limit, but since the 2004 "left lane law" you can be ticketed for impeding traffic in the passing lane even if you're driving at the speed limit (and you were always subject to ticketing if you were driving below the speed limit in the passing lane).
I guess the multi-lane open highway is the reason it's ok? Does that make those multi-lane open highways a free for all? No concept of a fast lane, overtake wherever you choose?
EDIT: Not all of the US, see below.
http://www.mit.edu/~jfc/right.html
States where it is illegal to pass on the right:
Arkansas, Illinois, Kentucky, Louisiana, Maine, Massachusetts, New Jersey (My note: In 20 years of driving in Illinois, I have never been cited for passing on the right)