I do not actively seek out upskirts. Really.
Yet I did notice that the escalator design plays a significant part in resulting whether a lady’s panties would be seen by others, beside the obvious factors of the her skirt length & cutting.
Upon passing the intersection point, the person riding downwards would have a back & upwards view of the commuters on the other escalator.
Since the ‘target’ is back-facing the ‘viewer’ and in an elevated position, the possibility of an upskirt occurrence is higher.
Not to mention the angle of elevation would gradually increase, and eventually reaching an optimum vantage point.
Oh my.. I’m perverted alright. Haha!
But again, I do not actively seek out upskirts. Really.