The middle lane is an overtaking lane just like any other lanes toward the middle of the roadway (reverse that for the handful of countries that drive on the other side of the road). Every country I’ve sat for a drivers test in has had that as a very basic concept and the single country I’ve actually seen it followed had the best damn driving experience (German’s follow the rules and their roads are better for it).










Also depends a bit by state (in the USA), Georgia enacted a law that essentially made it illegal to be passed on the right, speeding or not, if you are slower than the car behind you they want you to be to the right (https://law.justia.com/codes/georgia/title-40/chapter-6/article-9/section-40-6-184/).