While the study offers no direct visual proof of this happening, the types and locations of injuries seen from the cats that would have reached their terminal velocity seem to back up this idea.
Rather than simply comprising empty areas reserved for future expansion, they are landscaped courtyards, useful for pedestrians and a visual amenity for the passengers in the terminal above.
Reasonable work-rest schedule and good working environment is helpful to relieving and eliminating the VDT (visual display terminal) work fatigue and its influence on the health of operators.