Originally Posted by
Capvermell
Yes they do. That option is called the Close Parallel Runway.
Yes, I'm well aware that one of the three options is for a close-spaced runway which would operate in dependent segregated mode, where movements on one runway would be affected by movements on the other.
The runways would have to be used dependently i.e. operations on one runway temporarily interrupting operations on the other.
Exactly - with the emphasis on "temporarily". That's rather different from, for example, the current situation where the main and emergency runway can't under any circumstances be used simultaneously. Instead, it's a bit like saying that Windows (in the old single-core days) can't run two processes simultaneously, which while technically true, is only part of the story.
Likewise, the close-spaced parallel runway would increase overall runway capacity from around 55 movements per hour to about 70, though granted the wide-spaced option would up that to around 75 as well as providing other operational benefits.