From what I recall, what is now I-71 in Ohio was to be another Turnpike route, was any ROW acquisition, design or construction on what became I-71 actually initiated by the Ohio Turnpike Authority?
From Wikipedia (http://en.wikipedia.org/wiki/Interstate_71), though I'm certain I've read this account elsewhere:
"Much of Interstate 71 in Ohio was intended to be State Route 1. State Route 1 was originally planned in the 1950s as a second Ohio Turnpike extending southwest to northeast across the state. It was planned to run from Cincinnati to Conneaut and connect with an extension built across the panhandle of Pennsylvania to the New York State Thruway. As the highway was being planned, the Federal Aid Highway Act of 1956 was enacted, and the project was converted from a toll road to a freeway. It was designated as State Route 1, since the Interstate Highway numbering system had not yet been implemented. Portions of the freeway began to be completed and opened in 1959 with the new Interstate Highway funding, and they were marked as State Route 1 as well as with their new Interstate Highway number. Since large gaps existed along the corridor where no freeway had yet been completed, existing two-lane or four-lane highways were also designated as State Route 1 in order to complete the route. The State Route 1 signage was removed in 1966 as the Interstate Highway numbers adequately marked the route by then and the state highway numbering was superfluous."
TL;DR: The Interstate system got rolling before the Turnpike Commission could start.