I don't think there are hard and fast rules for this. Ultimately real people spend real time and real money installing real lights. So a lot of times, smaller airports with smaller budgets have no taxiway lighting at all. KDEN has all it's taxiways very well lit, and has the green centerline lights pretty much every where. That is a newer airport. KMSP doesn't have nearly the same amount of green centerline lighting. It is a bit older airport. I'm guessing things like centerline lighting need to be installed when the taxiway is built.
Possibly, but from what I've heard, the main reason for centreline lighting on runways is to support Cat II and III ILS approaches (down to a 50 ft ceiling); probably, the same applies to taxiway lighting, since you'll have ground ops in *extremely* low visibility.
My home airport, Ottawa, is fairly busy (including two ILS approaches and lots of big airliners), but we do not have runway or taxiway centreline lighting anywhere. Montreal/Dorval has centreline lighting on one runway, I think, but I don't remember seeing it on the taxiways when I flew in at night, and that's Canada's #2 airport.
I think that the best thing to do would be to leave taxiway centreline lighting out by default, and only include it when you have positive information that it's present in real life (probably only a few airports in any country). I'd be very surprised to see it anywhere that wasn't a major airline hub.
All the best,
David
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