Originally Posted by
alfaman
"From what I've seen over the years, it depends...overall, though, the principle that the strip that represents the obstructing aircraft is oriented so that it impedes the one it is obstructing"
Indeed, it depends is right, but for some, the strip below is seen as the one obstructing, for others it's the strip above, and I'd like to know why...
Ok, so I'm stretching back into the memory archives, but I think it relates to how the runway bay is used: going to be difficult to explain in words, but for some, the top of the bay is the close threshold, the bottom, the far threshold, such that an aircraft departing comes in at the top, &, when cleared for take off, is slid down the bay, until airborne, whereupon it leave the bay upwards. For others, it works in reverse; the strip is slid up the bay as the aircraft takes off. So the blocker goes in below or above, depending on how it's going to be "in the way" of that first departure.