In my experience in the NL, the far right lane is held by people going under the speed limit (truckers, cautious drivers). But if it’s not being held, people move into it and pass as needed. If it’s busy, the second lane will be held by people going the speed limit and the third lane by people passing them. The fourth lane is usually open all the time except to pass people passing people. Speed cameras are usually based on “average speed” so you can “save up” speed by going slower than the speed limit for awhile.
