Is it more space for aircraft to take off from? What is the point if one?
You can read about the displaced threshold here on Wikipedia:
Mainly it is to give landing aircraft obstruction clearance while still allowing a long runway for departures.
For example, SAN has one because there is a parking garage in front of runway 27.
Can planes be told to line up and wait on the displaced treshold while other plane is landing?
No. You only a can have one plane on the runway at all times unless it is being used as a taxiway.
Okay, thanks for all the help everyone!
I was wondering as sometimes it happens to me when on final that someone is cleared by ATC to line up and wait… I was never sure whether this is reason to go around or not.
I would go around.
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