Gates aren't manned 24/7. Go thru the gates after midnight, and you'll see that there is no attendant.
IMHO, sometimes the gates are hard to see, even though they are red and white. For me, it appears that the horizontal bar just blends into the scenery, especially at the exit gates. I would prefer that they were shiny yellow and red like the bumpers and backs of the fire trucks and ambulances. Easier to see.
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