As used in this act, the term:
(1) “Board of directors” means the board of directors of a corporation.
(2) “Construction” means construction or improvement, and the term includes landscaping.
(3) “Corporation” means a transportation corporation authorized to act on behalf of the department pursuant to this act.
(4) “Department” means the Department of Transportation.
(5) “Project” means any improvement to an existing highway that is included in the adopted work program.