The entry border has one lane dedicated to business-class and both Elite levels. it shares three or four positions with two lanes to the right, one for dips and crew, the other for TAV members (and, I think, some airlines).
In theory, when the other two lanes are empty, TKers get called over to the free positions. In practice this does not happen so much: lots of crew!
The make up of the priority lanes can change on a whim.
When it's a single server queue, you're vulnerable to difficult customers holding up the line.