Sitelinks for Subfolders
Over the last few weeks we’ve noticed Google has been giving out sitelinks to sub-folders of certain websites.

The sites receiving these are very big and have lots of authority so chances are if you don’t have sitelinks for your sub-folders already you won’t be getting any in the near future.

Comments
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That’s been happening since before January actually. And I’ve been noticing it on more and more sites since then – even ones that aren’t obviously “high authority” sites.
I have also seen some sites lose theirs, get them back and lose them again in the past few weeks.
Anyone else seeing some eratic changes recently?
@hamish – Sitelinks in general, or Sitelinks just at the subdirectory level? I’ve seen Google drop the number of Sitelinks displayed (from 8 links to 4, to 3 even), at the top domain level. Haven’t noticed any fluctuations at the subdirectory level, although I don’t track those very closely aside from just checking examples I blogged about previously.
what is the requirements for getting normal sitelinks? is it mainly based on high traffic? What is considered high traffic? PageRank? Links?