I have been wondering the same, I bought the lates Ncees guide from ncees website and is updated from the previous one with new problems reflecting the new specifications. Also I bought two more guides from a different vendor just google it
I bought this one any it was updated for the recent exam specifications. So for practice exams for the transportation depth I have the following:
NCEES Practice Exam, 6 Minute Solutions, Lindeburg, and the link I provided. That's 4 exams plus I am taking the school of PE for transo depth. If this isn't enough then I guess I'll have to reevaluate if I don't pass (Haven't taken it yet). What do you guys think?