(a) The commission shall determine the terms of a contract under this subchapter.
(b) The contract may not extend for a period of more than six years after the date of execution.
(c) The contract must provide that:
(1) the highway to be acquired is free of debts, liens, or other encumbrances at the time of acquisition;
(2) the highway to be constructed meets minimum design criteria prescribed by the commission;
(3) construction contracts are awarded through competitive bidding to the low bidder;
(4) priority of construction is assigned to particular highway segments;
(5) particular highway segments are opened to the public on completion of construction under right of entry even if consideration has not been paid by the commission; and
(6) the highway right-of-way is fully landscaped before acquisition by the commission.