[T.B. Yoits]

The painted spiral exists for a reason - so a ground crew member can tell if the engine is running.

Yes, but at 10:30 PM, I wonder how visible it was, and if it would have helped. It seems like many industries can't hire enough staff, putting additional workload on the existing ones, and forcing companies to hire very green staff.

[rlmorel]

At 10:30 PM on a tarmac where workers are, they would have no trouble seeing it. Those places are all reasonably well lit.