70 ILCS 5/14.2

Before the adoption of any ordinance providing for the issuance of such bonds, the board of commissioners of the authority shall cause a description and general plan for the project to be prepared and submitted to the Department of Transportation, together with an estimate of the cost of the project. The project and the plans and estimate of cost may be changed with the approval of the Department. Prior to undertaking the project, the final plans, specifications and estimate of cost must be approved by the Department. The requirements of this Section do not apply to airport projects consisting solely of commercial or recreational facilities or rail facilities or related facilities.