Foamer moment: I snagged a copy of the construction plans for the DNT/PGBT four-level Maltese cross stack interchange in Collin County, Texas. Both roads are now owned by NTTA, but the stack was actually built by TxDOT (under contract CSJ 2964-05-014, with title sheet signature dates in 1992), I think because the PGBT (then known as, and signed simply as, SH 190) was then under TxDOT jurisdiction.